In a certain college 33 percent of the physics majors

A student who didn't study for the upcoming quiz decides to 'wing it' and just guess on the 10 question quiz. Every question is True/False. What is the probability that his grade on the quiz will be at most 50%? Please express your answer as a percent rounded to the hundredths decimal place. Include the '%' symbol.

A student who didn't study for the upcoming quiz decides to 'wing it' and just guess on the 10 question quiz. Every question has 5 choices (a - e). What is the probability that his grade on the quiz will be at most 50%? Please express your answer as a percent rounded to the hundredths decimal place. Include the '%' symbol.

In a certain college, 33% of the physics majors belong to ethnic minorities. If 10 students are selected at random from the physics majors, that is the probability that no more than 6 belong to an ethnic minority? Round your answer to four decimal places.

Find the mean , µ, for a bionomial distribution where n = 50 and p = .175. Round the answer to the hundredths decimal place.

Find the mean , µ, for a bionomial distribution where n = 125 and p = 0.47 Round the answer to the hundredths decimal place.

Find the standard deviation for a bionomial distribution where n = 125 and p = 0.47. Round the answer to the hundredths decimal place.

Find the standard deviation for a bionomial distribution where n = 50 and p = .175. Round the answer to the hundredths decimal place.

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A bank's loan officer rates applicants for credit. The ratings are normally distributed with a mean of 200 and a standard deviation of 50. If an applicant is randomly selected, find the probability of a rating that is between 200 and 275. Your answer should be a decimal rounded to the fourth decimal place.

A bank's loan officer rates applicants for credit. The ratings are normally distributed with a mean of 200 and a standard deviation of 50. If an applicant is randomly selected, find the probability of a rating that is between 170 and 220. Your answer should be a decimal rounded to the fourth decimal place.

The volumes of soda in quart soda bottles are normally distributed with a mean of 32.3 oz and a standard deviation of 1.2 oz. What is the probability that the volume of soda in a randomly selected bottle will be less than 32 oz? Your answer should be a decimal rounded to the fourth decimal place.

The amount of rainfall in January in a certain city is normally distributed with a mean of 4.6 inches and a standard deviation of 0.3 inches. Find the value of the first quartile Q1. Round your answer to the nearest tenth.

In one region, the September energy consumption levels for single-family homes are found to be normally distributed with a mean of 1050 kWh and a standard deviation of 218 kWh. Find P45, which is the consumption level separating the bottom 45% from the top 55%. Round your answer to the nearest tenth.

Scores on a test have a mean of 73 and Q3 is 83. The scores have a distribution that is approximately normal. i n d space P subscript 90 (HINT: You will need to first find the standard deviation.) Round your answer to the nearest tenth.

For women aged 18-24, systolic blood pressures (in mm Hg) are normally distributed with a mean of 114.8 and a standard deviation of 13.1. If 23 women aged 18-24 are randomly selected, find the probability that their mean systolic blood pressure is between 119 and 122. Your answer should be a decimal rounded to the fourth decimal place.

A bank's loan officer rates applicants for credit. The ratings are normally distributed with a mean of 200 and a standard deviation of 50. If 40 different applicants are randomly selected, find the probability that their mean is above 215. Your answer should be a decimal rounded to the fourth decimal place.

Human body temperatures are normally distributed with a mean of 98.20oF and a standard deviation of 0.62oF If 19 people are randomly selected, find the probability that their mean body temperature will be less than 98.50oF. Your answer should be a decimal rounded to the fourth decimal place.

The average amount of money that a student at UCLA carries on his/her person is $25 with a standard deviation of $3. What is the probability that a randomly sample of 25 UCLA University students will have an average of more than $26 on them? (Give your answer as a decimal rounded to 4 decimal places)

In one region, the September energy consumption levels for single-family homes are found to be normally distributed with a mean of 1050 kWh and a standard deviation of 218 kWh If 50 different homes are randomly selected, find the probability that their mean energy consumption level for September is greater than 1075 kWh. Your answer should be a decimal rounded to the fourth decimal place.

To the nearest thousandth, find the "p-value" in a two-tail hypothesis test given the Test Statistics z = 2.57

To the nearest thousandth, find the 'p-value' in a two-tail hypothesis test given the Test Statistics z = -2.11

Find the "p-value" in a right-tail hypothesis test performed in the "t-Distribution" when n = 22 and the test statistic = 2.518. Give your answer to the nearest hundredth decimal place.

Find the "p-value" in a two-tail hypothesis test performed in the "t-Distribution" when n = 17 and the test statistic = -2.583. Give your answer to the nearest hundredth decimal place.

Find the critical value for a two-tailed hypothesis test in which α = .02 Assume that this is a normal distribution. Round your answer to the thousandth decimal place.

Find the critical value for a right-tailed hypothesis test in which α = .05 Assume that this is a normal distribution. Round your answer to the thousandth decimal place.

Find the critical value in the t-distribution for a two-tailed hypothesis test in which α = .02 and n = 23 Round your answer to the thousandth decimal place.

Find the critical value in the t-distribution for a two-tailed hypothesis test in which α = .05 and n = 25 Round your answer to the thousandth decimal place.

An inspector inspects a shipment of medications to determine the efficacy in terms of the proportion p in the shipment that failed to retain full potency after 60 days of production. To do so, she selects an SRS of 200 pills. Suppose that eight of the pills have failed to retain their full potency. The proportion 'p-hat' for the proportion of pills that have failed to retain their potency is... (Give your answer as a two place decimal)

Gallup took in 2013 a nationally representative sample of 2027 adults and asked them about their soda consumption. The survey shows that 486 of those surveyed mostly drink diet soda. The proportion 'p-hat' for the proportion of adults who mostly drink diet soda is... (Give your answer as a two place decimal)

A phycologist is interested in determining the proportion of algae samples from a local rivulet that belonged to a particular phylum. A random sample of 50 alga was obtained and each alga was categorized as either being cyanobacteria or not. It was found that 38 were, in fact, cyanobacteria. The proportion 'p-hat' that were cyanobacteria is

The American Veterinary Medical Association conducted a survey of veterinary clinics to estimate the proportion that do not treat large animals (cows, horses, etc.). In the survey of 120 randomly selected veterinary clinics throughout the country, 88 responded they do not treat large animals. The test statistic for the above hypothesis test about the proportion of clinics that do not treat large animals is... (Round your answer to two decimal places)

A researcher claims that at least 10% of young children suffer from some food allergy. A survey of food allergies in a random sample of 184 young children found that 13 had some food allergy. The test statistic for the above hypothesis test about young children that have food allergies is... (Give your answer as a decimal rounded to the nearest hundredths)

A clinic believes that a majority of migraine prone patients would benefit for Botox therapy and see a complete migraine elimination. A study examined the effectiveness of Botox injections in the corrugator supercilii muscles for the treatment of chronic migraines. Of the 29 migraine-prone patients participating in the study, 16 reported complete migraine elimination. The test statistic for the above hypothesis test regarding migraine-prone patients is... (Round your answer to two decimal places)

Of 126 adults selected randomly from one town, 33 of them smoke. Find the best point estimate for the true percentage of all adults in the town that smoke. Express your answer as a percent rounded to the nearest hundredths.

An inspector inspects a shipment of medications to determine the efficacy in terms of the proportion p in the shipment that failed to retain full potency after 60 days of production. Unless there is clear evidence that this proportion is less than 0.05, she will reject the shipment. To reach a decision, she will test the following a large-sample. To do so, she selects an SRS of 200 pills. Suppose that eight of the pills have failed to retain their full potency. The best point estimate for a 95% confidence interval for the true proportion of pills in the shipment that have failed to retain full potency is___. Round your answer to three decimal places.

There is growing concern over a possible causal link between consumption of diet soda and obesity. Gallup took in 2013 a nationally representative sample of 2027 adults and asked them about their soda consumption. In the sample, 921 adults described themselves as overweight, and 295 of them said that they mostly drink diet soda. Based on the results, the best point estimate for a 95% confidence interval for the proportion p of overweight American adults who mostly drink diet soda is____ Answer using a decimal rounded to the third decimal place.

A laboratory tested 72 chicken eggs and found that the mean amount of cholesterol was 240 milligrams with s=19.6 milligrams. The best point estimate for a 95 percent confidence interval for the true mean cholesterol content, μ, of all such eggs is _____milligrams.

A first-aid cream contains amounts of the active ingredient (in mg) that vary Normally with unknown mean m and standard deviation s from tube to tube. You select a simple random sample of 9 tubes and assess the quantity of active ingredient they contain. The 9 amounts, in mg, are

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Based on these data, the best point estimate for a 99% confidence interval estimate of the active ingredientis ____ mg.

When engaging in weight-control (fitness/fat burning) types of exercise, a person is expected to attain about 160% of their maximum heart rate. For 20-year-olds, this rate is approximately 120 bpm. A simple random sample of one hundred 20-year-olds was taken, and the sample mean was found to be 107 bpm with a standard deviation of 45 bpm. Researchers wonder if this is evidence to conclude that the expected level is actually lower than 120 bpm. Based on the sample, the best point estimate for the population mean is _____ bpm.

There is growing concern over a possible causal link between consumption of diet soda and obesity. Gallup took in 2013 a nationally representative sample of 2027 adults and asked them about their soda consumption. In the sample, 921 adults described themselves as overweight, and 295 of them said that they mostly drink diet soda. Based on the results, a 95% confidence interval for the proportion p of overweight American adults who mostly drink diet soda is Answer using Interval notation and using decimals rounded to the third decimal place.

The height (in inches) of males in the United States is believed to be Normally distributed. The average height of a random sample of 50 American adult males is 69.72 inches and the standard deviation of the 50 heights is s = 4.23. The 95% Confidence Interval for the average height if males in the United States is_____ Answer using 'Margin of Error' (plus or minus) notation with decimals rounded to the hundredths place.)

A first-aid cream contains amounts of the active ingredient (in mg) that vary Normally with unknown mean m and standard deviation s from tube to tube. You select a simple random sample of 9 tubes and assess the quantity of active ingredient they contain. The 9 amounts, in mg, are

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Find the 99% confidence interval for the population mean. Use Interval Notation with decimals rounded to the thousandths place.

Clinical literature reports that the duration of a typical cold is roughly 18 days. Researchers wanted to know if people tend to underestimate the duration of a typical cold, on average. They surveyed a random sample of 352 healthy adults in Georgia and asked them how long they think that a typical cold lasts. The researchers reported a 95% confidence interval of 6.9 to 8.2 days for the mean expected duration of typical cold. The numerical value of the margin of error for the confidence interval reported here is _____ days.

A first-aid cream contains amounts of the active ingredient (in mg) that vary Normally with unknown mean m and standard deviation s from tube to tube. You select a simple random sample of 9 tubes and assess the quantity of active ingredient they contain. The 9 amounts, in mg, are

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Based on these data, a 99% confidence interval for the population mean m has margin of error of ____ mg.

A statistics student would like to estimate the average age of students at her college. She would like to be 85% confident that her estimate includes the actual college population mean. She did a smaller preliminary survey and found that a reasonable estimate of the population standard deviation was 4 1/2 years. How many people must she survey if she wants to be within 1/2 year of the true population mean? Please round OFF your answer to the nearest integrer.

In order to estimate the mean amount of time computer users spend on the internet each​ month, how many computer users must be surveyed in order to be 90​% confident that your sample mean is within 14 minutes of the population​ mean? Assume that the standard deviation of the population of monthly time spent on the internet is 198 min. The minimum sample size required is_______computer users.​(Round UP to the nearest whole​ number.)

A statistics student would like to estimate the average age of students at her college. She would like to be 98% confident that her estimate includes the actual college population mean. She did a smaller preliminary survey and found that a reasonable estimate of the population standard deviation was 3 1/2 years. How many people must she survey if she wants to be within 1/4 year of the true population mean? Please round OFF your answer to the nearest integrer.

A statistics student would like to estimate the average age of students at her college. She would like to be 99% confident that her estimate includes the actual college population mean. She did a smaller preliminary survey and found that a reasonable estimate of the population standard deviation was 2 1/2 years. How many people must she survey if she wants to be within 1/2 year of the true population mean? Please round OFF your answer to the nearest integrer.

An IQ test is designed so that the mean is 100 and the standard deviation is 14 for the population of normal adults. Find the sample size necessary to estimate the mean IQ score of statistics students such that it can be said with 90​% confidence that the sample mean is within 2 IQ points of the true mean. Determine the required sample size using the TI-83/84. The required sample size is________​(Round UP to the nearest​ integer.)

Find the sample​ size, n, needed to estimate the percentage of adults who have consulted fortune tellers. Use a 0.02 margin of​ error, use a confidence level of 98​% and use results from a prior poll suggesting that 20% of adults have consulted fortune tellers. (Round up to the nearest​ integer.)

A programmer plans to develop a new software system. In planning for the operating system that he will​ use, he needs to estimate the percentage of computers that use a new operating system. How many computers must be surveyed in order to be 99% confident that his estimate is in error by no more than four percentage points question marks? Assume that nothing is known about the percentage of computers with new operating systems. (Round up to the nearest​ integer.)

A programmer plans to develop a new software system. In planning for the operating system that he will​ use, he needs to estimate the percentage of computers that use a new operating system. How many computers must be surveyed in order to be 99% confident that his estimate is in error by no more than three percentage points question marks? Assume that nothing is known about the percentage of computers with new operating systems. (Round up to the nearest​ integer.)

Find the sample​ size, n, needed to estimate the percentage of adults who have consulted fortune tellers. Use a 0.04 margin of​ error, use a confidence level of 95​% and use results from a prior poll suggesting that 16​% of adults have consulted fortune tellers. (Round up to the nearest​ integer.)

Many states are carefully considering steps that would help them collect sales taxes on items purchased through the Internet. How many randomly selected sales transactions must be surveyed to determine the percentage that transpired over the​ Internet? Assume that we want to be 90​% confident that the sample percentage is within four percentage points of the true population percentage for all sales transactions. (Round up to the nearest​ integer.)

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