Qnt 561 week 1 practice quiz

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1. What is statistics

2. Explain the difference between descriptive and inferential statistics

3. Explain the difference between qualitative and quantitative data

4. Explain how populations and variables differ

5. Explain how populations and samples differ

6. What is a representative sample

7. Explain the difference between a population and a process

8. Define statistical thinking

9. Suppose you are given a data set that classifies each sample into one of the four categories A, B, C, D

10. Identify each of the following variables as qualitative or quantitative

11. Each month interviewers visit about 55,000 of the 87 million households in the region and question the occupants over 18 years of age about their education status

12. Complete the table to the rightFrequency and relative frequency

13. In one university language professors incorporated a 10-week extensive reading program to improve students Japanese reading comprehension, The professor collected 253 books originally written

14. A group of marketing professors asked every fourth adult entrant to a mall to participate in a study

15. Graph the relative frequency histogram for the 500 measurements summarized in the relative frequency table to the right

16. If jobs arrive at a particular work center at a faster rate than they depart, the work center impedes the overall production process and is referred to as a bottleneck

17. A data set contains the observations 1, 3, 4, 2,3 Find the following values

18. Calculate the mean and median of the following grade point averages

19. Five banks have been ranked by the amount charged to credit and debit cards issued by the banks. The table to the right gives the total amount charged in 2007 for the top ranked banks

20. The data on the age (in years) of each of the 20 most powerful women in a region are shown below

21. The salaries of superstar professional athletes receive much attention in the media. The multimillion-dollar long-term contract is now commonplace

22. Calculate the range, variance and standard deviation for the following sample

23. Aa

24. A country’s energy information administration monitors all nuclear power plants operating in that country. The table to the right lists the number of active nuclear power plants

25. A study of 100,000 first-time candidates for the CPA exam found that the mean number of semester hours of college credit taken by the candidates was 141.27 hours

26. Compute the z-score corresponding to each of the values of x below

27. Compare the z scores to decide which of the x values below lie the greatest distance above the mean and the greatest distance below the mean

28. A sample data set has a mean of 56 and a standard deviation of 10. Determine whether each of the following sample measurements are outliers.

29. Consider the horizontal plot shown to the right . a. What is the median, b What are upper and lower quartile, c. what is interquartile range

30. Educators are constantly evaluating the efficacy of public schools in the education and training of students

31. Data on annual rainfall, maximum daily temperature, percentage of plant cover, and number of ant species recorded at each of 11 study sites are given in the accompanying table.

32. Determine whether the random variable is discrete or continuous

33. The random variable x has the following discrete probability distribution. Complete parts a through f

34. The probability distribution for the number of customer arrivals per 15-minute period at a fast food restaurant is shown below

35. If x is a binomial random variable, compute p(x) for each of the cases below: a. n = 4, x = 2, p = 0.6

36. According to a business magazine, 29% of all small businesses owned by non-Hispanic whites nationwide are women-owned firms. a. in a sample

37. According to a certain golf-association, the weight of the golf ball shall not be greater than 1.20 ounces. The diameter of the ball shall not be less than 1.680 inches

38. Find the area under the standard normal probability distribution between the following pairs of z-score

39. Suppose the random variable x is best described by a normal distribution with u = 27 and sd =4 Find the z-score that corresponds to each of the following x-values.

40. The mean gas mileage for a hybrid car is 56 miles per gallon. Suppose that the gasoline mileage is approximately normally distributed with a standard deviation of 3.3 miles per gallon

41. Personnel tests are designed to test a job applicant’s cognitive and/or physical abilities. A particular dexterity test is administered nationwide by a private testing service

42. Determine evidence to support or contradict the assumption that the data to the right come from an approximate normal distribution.

43. An airport terminal handles an average of 3,000 international passengers an hour, but is capable of handling twice that number.

44. Will the sampling distribution of x always be approximately normally distributed? Explain

45. The number of semester hours of college credit taken by first-time candidates for a certain professional exam has a distribution with a mean of 144 hours and a standard deviation of 17 hours.