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### 69 Multiple choice questions

1. If we change a 99% confidence interval estimate to a 95% confidence interval estimate, we can expect...
2. In a frequency distribution table, the sum of frequencies for all classes for a variable will always equal..
3. A histogram is said to be skewed to the right if it has a
4. For each of the following examples, identify the sampling method.

Question 1
An economist is selected at random from the first 1,000 economists listed in an online directory of members of the American Economic Association. Every 1,000 economist threafter is included in the sample.

Question 2
In a study of managers at a large firm, managers are categorized into three groups according to their division (field, production, or corporate). A simple random sample is taken from each group, and data are collected on each manager in the sample.

Question 3
In a study of hospital emergency room usage, a random sample of hospitals is selected. For the hospitals in the sample, data are collected on every patient who arrives at the emergency room during a particular month.

Question 4
Clients arriving ar a free income-tax preparation service check in with a receptionist who collects basic information about them. Whenever a client has a February or an August birthday, the next client to check in is included in the sample.
5. An interval estimate is a range of values used to estimate
6. A standard normal distribution has a mean of [x] and a standard deviation of [y]. (This question expects numeric answers.)
7. In order to determine an interval estimate for the mean of a population with an unknown standard deviation, a sample of 60 items is selected. The mean of the sample is determined to be 23. What is the number of degrees of freedom for determining the appropriate t-value?
8. In computing the standard error of the mean, the finite population correction factor is used when...
9. For a given level of Type I error, as the sample size increases, the level of Type II error...
10. Eleven individuals are candidates for two scholarships. The first award is \$5000, and the second is \$3000. How many different assignments of the awards are possible?
11. Of ten banks receiving TARP funds, only four actually increased lending. If you select five banks from the ten banks for further analysis, what is the probability that two or more of the banks selected had increased lending? Round your answer to three decimal places.
12. What type of error occurs if you fail to reject the null hypothesis when, in fact, it is not true?
13. On a street, the houses are numbered from 300 to 450. The house numbers are examples of...
14. A sample of 225 elements from a population with a standard deviation of 90 is selected. The sample mean is 180 and the margin of error at a 95% confidence level is 11.76. What is the upper value for a 95% confidence interval for the population mean?
15. The student body of a large university consists of 60% female students. A random sample of 8 students is selected.

What is the probability that no more than three of the students in the sample are female? Enter your answer as a decimal round to three places.
16. The numbers of hours worked (per week) by 400 statistics students are shown below.

Number of hours Frequency
0 - 9 20
10 - 19 80
20 - 29 200
30 - 39 100

The cumulative frequency for the class of 20 - 29 is...
17. The measure of location which is the most likely to be influenced by extreme values in the data set is the...
18. A survey collects information on mortgage delinquencies and foreclosures. In the most recent survey, 6% of all mortgages (prime & subprime) were delinquent. It was further found that 16% of subprime mortgages are delinquent. Thus, it can be concluded that...
19. When the data are skewed to the right, the measure of Skewness will be...
20. A population of 10,000 students spends an average of \$12.50 a day on dinner. The standard deviation of the expenditure is \$4. A simple random sample of 64 students is taken. What is the expected value of the sampling distribution of the sample mean? Round your answer to 2 decimal places and no dollar sign.
21. Playbill Magazine reported that the mean annual household income of its readers is \$119,155. Assume this estimate of the mean is based on a sample of 80 households, and based on past studies, the population standard deviation is known to be \$30,000. What is the margin of error at a 95% level of confidence? Round your answer to two decimal places and enter it without a dollar sign.
22. An experiment consists of four outcomes with P(E1) = 0.2, P(E2) = 0.2, and P(E3) = 0.4. The probability of outcome E4 is...
23. The number of customers that enter a store during one day is an example of...
24. Suppose an automobile manufacturer has created a new vehicle and wants the vehicle's city mpg to be at least 25 mpg. The manufacturer hires two organizations to test the new vehicle. The first organization obtains a sample average of 23 mph. The second obtains 28 mpg. Which of the following actions would be the most ethical?
25. The student body of a large university consists of 60% female students. A random sample of 8 students is selected.

What is the expected number of females in the sample?
26. Forty percent of the students who enroll in a statistics course go to the statistics laboratory on a regular basis. Past data indicates that 80% of those students who use the lab on a regular basis make a grade of A in the course. If you randomly select one student from the class, what is the probability that this student went to the lab and received a grade of A? Enter your answer rounded to three decimal places.
27. The difference between the largest and the smallest data values is the
28. For a sample size of 75 determine the crtitical value for a two-tail hypothesis test at a 5% level of significance when the population standard deviation is unknown. Round your answer to three decimal places.
29. After using a website you are ask to rate your experience. You are given the options of excellent, very good, good, and poor. This is an example of the
30. Which of the following graphical methods is used to display and compare two varaibles?
31. When the p-value is used for hypothesis testing, the null hypothesis is rejected if...
32. In the past, 75% of the tourists who visited Chattanooga went to see Rock City. The management of Rock City recently undertook an extensive promotional campaign. They are interested in determining whether the promotional campaign actually increased the proportion of tourists visiting Rock City. The alternative hypothesis is...
33. The set of measurements collected for a particular element is (are) called...
34. As the sample size increases, the..
35. Smaller values of the standard deviation result in a normal curve that is...
36. Michael's Compute-All, a national computer retailer, has kept a record of the number of laptop computers they have sold for a period of 80 days. Their sales records are shown below:

Number of Laptops Sold Number of Days

0 - 19 5
20 - 39 15
40 - 59 30
60 - 79 20
80 - 99 10

The number of days in which the company sold less than 40 laptops is...
37. As the sample size increases, the margin of error..
38. The student body of a large university consists of 60% female students. A random sample of 8 students is selected.

What is the probability that more than five of the students in the sample are female? Enter your answer as a decimal round to three places.
39. The time required to load a truck is exponentially distributed with a mean of 30 minutes. What is the probability that a truck will take at least 40 minutes to load. Enter your answer as a decimal rounded to 3 decimal places...
40. When the smallest and largest percentage of items are removed from a data set and the mean is computed, the mean of the remaining data is...
41. A committee of 8 is to be selected from a group of 12 people. How many possible different committees can be selected?
42. A population of 10,000 students spends an average of \$12.50 a day on dinner. The standard deviation of the expenditure is \$4. A simple random sample of 64 students is taken. what is the probability that these 64 students will spend less than \$832? Enter your answer as a decimal and not as a percent and round your answer to 3 decimal places.
43. The assembly time for a product is uniformly distributed between 6 to 10 minutes.
The probability of assembling the product in 7 minutes or less is...
44. "DRUGS R US" is a large manufacturer of various kinds of liquid vitamins. The quality control department has noted that the bottles of vitamins marked 6 ounces have an average of 6 ounces but vary in content with a standard deviation of 0.3 ounces. Assume the contents of the bottles are normally distributed. Ninety percent of the bottles will contain no more than how many ounces? Round your answer to 2 decimal places.
45. Bayes' theorem is used to compute...
46. A portion of the population selected to represent the population is called
47. An app provides the price of gasoline at various locations around the city. The data provided in the app would be considered...
48. Determine the t value for a 95% confidence interval estimate for a sample size of 100. Round your answer to three decimal places.
49. For a sample of retired NFL players, data are collected on the number of concussions each experienced during his career. This study would be considered...
50. A very short quiz has three questions: one multiple choice question with five possible choices (a, b, c, d, e) and two true or false questions. Assume you are taking the quiz but do not have any idea what the correct answers are but you select answers anyway. What is the probability you have given the correct answer to all three questions? Enter your answer as a decimal rounded to three decimal places.
51. A tabular method that can be used to summarize the data on two variables simultaneously is called...
52. The sales of a grocery store had an average of \$8,000 per day. The store introduced several advertising campaigns in order to increase sales. To determine whether or not the advertising campaigns have been effective in increasing sales, a sample of 64 days of sales was selected. It was found that the average was \$8,225 per day with a sample standard deviation of of \$1,200. The value of the test statistic is 1.5. The p-value associated with this test statistic is...
53. The probability distribution for the number of goals the Lions soccer team makes per game is given below.

Number Of Goals Probability
0 0.05
1 0.25
2 0.25
3 0.30
4 0.15
The expected number of goals per game is
54. For a sample of coffee shop customers, the wait times in seconds were recorded. Wait time is an example of a variable that uses the...
55. The probability that a continuous random variable takes any specific value is...
56. The weight of football players is normally distributed with a mean of 200 pounds and a standard deviation of 20 pounds.

What percent of players weigh between 180 and 220 pounds? Round your answer to three decimal places.
57. The purpose of statistical inference is to provide information about the...
58. A population of 10,000 students spends an average of \$12.50 a day on dinner. The standard deviation of the expenditure is \$4. A simple random sample of 64 students is taken. what is the standard deviation of the sampling distribution of the sample mean? Round your answer to 3 decimal places and no dollar sign.
59. A continuous probability distribution that is useful in describing the time, or space, between occurrences of an event is a(n)
60. Temperature is an example of a variable that uses...
61. The average number of cars that pass through a rural intersection in a fifteen minute interval is 5.3. It can be assumed that the probability of an occurrence is the same in any two-time periods of equal length.
Determine the probability that there are 6 occurrences or less in fifteen minutes. Enter your answer as a decimal rounded to three places.
62. In the 2010 Census respondants are asked to select their sex as male or female. In this context sex is an example of the
63. The sales of a grocery store had an average of \$8,000 per day. The store introduced several advertising campaigns in order to increase sales. To determine whether or not the advertising campaigns have been effective in increasing sales, a sample of 64 days of sales was selected. It was found that the average was \$8,150 per day with a sample standard deviation of \$1,200.
64. Assume you have applied for two jobs A and B. The probability that you get an offer for job A is 0.30. The probability of being offered job B is 0.20. The probability of getting at least one of the jobs is 0.45. What is the probability that you will be offered both jobs? Enter your answer as a decimal rounded to three places.
65. If two events, A and B, are mutually exclusive, the probability of A intersection B...
66. In hypothesis testing, the tentative assumption is that...
67. The difference between the third quartile and the first quartile
68. A numerical value used as a summary measure for a sample, such as sample mean
69. The life expectancy of computer terminals is normally distributed with a mean of 4 years and a standard deviation of 1 year. What is the probability that a terminal will last 6 years or less? Use Excel and round your answer to three decimals...