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Qnt 351 final exam

17/11/2020 Client: papadok01 Deadline: 3 days

1)An auditor for American Health Insurance reports that 20% of policyholders submit a claim during the year. 15 policyholders are selected randomly. What is the probability that at least 3 of them submitted a claim the previous year?





2) A research firm conducted a survey to determine the mean amount steady smokers spend on cigarettes during a week. A sample of 64 smokers revealed that  = $20 and S = $5. What is the 95% confidence interval for μ? ​

$18.78 to $21.23

​18.16 to 21.84

​$18.60 to $21.40

​18.37 to 21.63

3) When a class interval is expressed as 100 up to 200, _________________________. ​

Observations with values of 200 are included in the class

​Observations with values of 200 are excluded from the class

​Observations with values of 100 are excluded from the class

​The class interval is 99

4) A group of women tried five brands of fingernail polish and ranked them according to preference. What level of measurement is this? ​





5) A time series trend equation for Hammer Hardware is Y’ = 5.6 + 1.2t, where sales are in millions of dollars and t increases by one unit for each year. If the value of sales in the base year of 2016 is $5.6 million, what would be the estimated sales amount for 2018?

$8 million

​$6.8 million

​Unable to determine from given information

​$5.6 million

6) A weight-loss company wants to statistically prove that its methods work. They randomly selected 10 clients who had been on the weight loss program for between 55 and 65 days. They looked at their beginning weights and their current weight. The statistical test they should utilize is:​

t test for difference in paired samples

​z test for two population proportions

​z test for two population means

​t test for two population means

7) A coffee manufacturer is interested in whether the mean daily consumption of regular-coffee drinkers is less than that of decaffeinated-coffee drinkers. A random sample of 50 regular-coffee drinkers showed a mean of 4.35 cups per day, with a standard deviation of 1.2 cups per day. A sample of 40 decaffeinated coffee drinkers showed a mean of 5.84 cups per day, with a standard deviation of 1.36 cups per day. What is your computed z-statistic?​

z = -2.45

​z = -5.44

​z = -1.81

​z = – 3.90

8) A hypothesis regarding the weight of newborn infants at a community hospital is that the mean is 6.6 pounds. A sample of seven infants is randomly selected and their weights at birth are recorded as 9.0, 7.3, 6.0, 8.8, 6.8, 8.4, and 6.6 pounds. What is the alternate hypothesis? ​

H1: µ ≠ 6.6

​H1: µ ≥ 6.6

​H1: µ > 7.6

​H1: µ = 6.6

9) As the size of the sample increases what happens to the shape of the distribution of sample means? ​

It approaches a normal distribution.

​It cannot be predicted in advance.

​It is positively skewed.

​It is negatively skewed.

10) You perform a hypothesis test at the .05 level of significance. Your computed p-value turns out to .042. What is your decision about the hypothesis?

You would reject Ho

​You would accept Ho

​You would accept Ho if it is a two-tailed test, but reject Ho if a one-tailed test

​You can’t render a decision unless you know the computed test statistic

11) University officials say that at least 70% of the voting student population supports a fee increase. If the 95% confidence interval estimating the proportion of students supporting the fee increase is [0.75, 0.85], what conclusion can be drawn? ​

Since this was not based on the population, no conclusion can be drawn.

​Seventy percent is not in the interval, so assume it will not be supported.

​The interval estimate is above 70%, so infer that it will be supported.

​Seventy percent is not in the interval, so another sample is needed.

12) The mean of a normal distribution is 400 pounds. The standard deviation is 10 pounds. What is the probability of a weight between 415 pounds and the mean of 400 pounds?





13) The MacBurger restaurant chain claims that the waiting time of customers for service is normally distributed, with a mean of 3 minutes and a standard deviation of 1 minute. The quality-assurance department found in a sample of 50 customers at the Warren Road MacBurger that the mean waiting time was 2.75 minutes. When you perform a test of hypothesis, what would be the resulting p-value? ​





14) The tread life of tires mounted on light-duty trucks follows the normal probability distribution with a mean of 60,000 miles and a standard deviation of 4,000 miles. Suppose you bought a set of four tires, what is the likelihood the mean tire life of these four tires is between 57,000 and 63,000 miles?


​Very likely



15) In a distribution, the second quartile corresponds with the __________.​





16) A group of 100 students was surveyed about their interest in a new International Studies program. Interest was measured in terms of high, medium, or low. In the study, 30 students responded high interest, 40 students responded medium interest, and 30 students responded low interest. What is the relative frequency of students with high interest? ​





17) The Director of Golf for a local course wants to study the number of rounds played by members on weekdays. He gathered the sample information shown below for 520 rounds. At the .05 significance level, is there a difference in the number of rounds played by day of the week?













No, because χ2 = 11.793

​Yes, because χ2 = 15.308

​No, because χ2 = 7.715

​Yes, because χ2 = 12.288

18) Which approach to probability assumes that the events are equally likely?​


​Mutually exclusive



19) Sales at a fast-food restaurant average $6000 per day. The restaurant decided to introduce an advertising campaign to increase daily sales. To determine the effectiveness of the advertising campaign, a sample of 49 days of sales was taken. It found that the average daily sales were $6,400 per day. From past history, the restaurant knew that its population standard deviation is about $1,000. The value of the test statistic is _______. ​






20) A study by the National Park Service revealed that 50% of the vacationers going to the Rocky Mountain region visit Yellowstone Park, 40% visit the Grand Tetons, and 35% visit both. What is the probability that a vacationer will visit at least one of these magnificent attractions?





21) The ages of all the patients in the isolation ward of the hospital are 38, 26, 13, 41, and 22. What is the population standard deviation? ​





22) The distribution of a sample of the outside diameters of PVC pipes approximates a symmetrical, bell-shaped distribution. The arithmetic mean is 14.0 inches, and the standard deviation is 0.1 inches. About 68% of the outside diameters lie between what two amounts? ​

13.5 and 14.5 inches

​13.9 and 14.1 inches

​13.0 and 15.0 inches

​13.8 and 14.2 inches

23) Each month the National Association of Purchasing Managers publishes the NAPM index. One of the questions asked on the survey to purchasing agents is: Do you think that the economy is expanding? Last month, of the 300 responses, 160 answered “yes” to the question. This month, 170 of the 290 responses indicated that the economy is expanding. If you’re testing to find if a larger proportion of agents believe that the economy is expanding this month, what is your computed test statistic?

z = -1.29

​t = -1.25

​t = -1.07

​z = -1.11

24) The first card selected from a standard 52-card deck was a king. If it is returned to the deck, what is the probability that a king will be drawn on the second selection?

​1/3 or 0.33

​1/13 or 0.077

​1/4 or 0.25

​12/13 or 0.923

25) An example of a qualitative variable is _________________. ​

Weight of a person

​Miles between oil changes

​Number of children in a family

​Color of ink in a pen

26) Which of the following is true regarding the normal distribution? ​

It has two modes.

​The points of the curve meet the x-axis at z = -3 and z = 3.

​It is asymmetrical.

​The mean, median, and mode are all equal.

27 )What is the range of values for a coefficient of correlation?

Unlimited range

​0 to +1.0

​-1.0 to +1.0 inclusive

​-3 to +3 inclusive

28) Consider the following regression analysis between sales (Y in $1000) and social media advertising (X in dollars). = 55,000 + 7X

The regression equation implies that an:

​​increase of $1 in advertising is associated with an increase of $7,000 in sales.

​increase of $1 in advertising is associated with an increase of $62,000 in sales.

​increase of $7 in advertising is associated with an increase of $7,000 in sales.

​increase of $1 in advertising is associated with an increase of $7 in sales.

29) When statisticians analyze sample data in order to draw conclusions about the characteristics of a population, this is referred to as: ​

Descriptive statistics

​Data summarization

​Statistical inference

​Data analysis

30) What is the median of 26, 30, 24, 32, 32, 31, 27, and 29? ​





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