1. A computer manufacturer claims its computers will perform effectively for more than 5 years. Which pair of hypotheses should be used to test this claim?    H0: μ ≤ 5; Ha: μ > 5
2. A meteorologist stated that the average temperature during July in Chattanooga was 80 degrees. A sample of July temperatures over a 32-year period was taken. The correct set of hypotheses is   H0: μ = 80 Ha: μ ≠ 80
3. A numerical measure computed frm a sample, such as sample mean, is known as a _____.  Sample statistic
4. A numerical measure computed from a sample, such as sample mean, is known as a   sample statistic
5. A numerical measure, such as a mean, computed from a population is known as a   population parameter
6. A one-tailed test is a hypothesis test in which rejection region is   in one tail of the sampling distribution
7. A procedure used for finding the equation of a straight line that provides the best approximation for the relationship between the independent and dependent variables is    the least squares method
8. A random sample of 16 students selected from the student body of a large university had an average age of 25 years. We want to determine if the average age of all the students at the university is significantly different from 24. Assume the distribution of the population of ages is normal with a standard deviation of 2 years.At a .05 level of significance, it can be concluded that the mean age is   not significantly different from 24
9. A regression analysis between demand (y in 1000 units) and price (x in dollars) resulted in the following equation:ŷ = 9 − 3xThe above equation implies that if the price is increased by $1, the demand is expected to   decrease by 3,000 units
10. A regression analysis can be used to determine    if a linear relationship exists between two quantitative variables.
11. A researcher has collected the following sample data. The mean of the sample is 5. The variance, 5^2 is ____   16.5
12. A soft drink filling machine, when in perfect adjustment, fills the bottles with 12 ounces of soft drink. Any overfilling or underfilling results in the shutdown and readjustment of the machine. To determine whether or not the machine is properly adjusted, the correct set of hypotheses is   H0: μ = 12 Ha: μ ≠ 12
13. A two-tailed test is performed at a 5% level of significance. The p-value is determined to be .09. The null hypothesis   should not be rejected
14. An important measure of location for categorical data is the    mode
15. Application of the least squares method results in values of the y-intercept and the slope that minimizes the sum of the squared deviations between the   observed values of the dependent variable and the predicted values of the dependent variable
16. As a general guideline, the research hypothesis should be stated as the   alternative hypothesis
17. Compute the 70th percentile   62
18. Compute the weighted mean for the following data. Select your answers from the choices below.   17
19. Find the coefficient of variation   31.4%
20. For a two-tailed hypothesis test about a population mean, the null hypothesis can be rejected if the confidence interval   does not include μ0
21. Generally, which of the following is the least appropriate measure of central tendency for a data set that contains outliers?   Mean
22. Generally, which of the following is the least appropriate measure of central tendency for a data set that contains outliers?  Mean
23. he life expectancy of a particular brand of tire is normally distributed with a mean of 40,000 and a standard deviation of 5,000 miles.Refer to Exhibit 6-6. What is the probability that a randomly selected tire will have a life of exactly 47,500 miles?   0
24. If a hypothesis is not rejected at a 5% level of significance, it will   also not be rejected at the 1% level
25. In 2000, the average hours of television watched weekly in a household was 5 with a standard deviation of 1.43. In 2002, average hours of television watched weekly in a household was 8 with a standard deviation of 3.12. Which of the following statements is correct?   The number of hours is more variable in the year 2002.
26. In a two-tailed hypothesis test, the null hypothesis should be rejected if the p-value is   less than or equal to αless than or equal to α
27. In an aplpication for a credit card, potential customers are asked for their social security number is an example of a    Categorical variable
28. In constructing a frequency distribution, as the number of classes is decreased, the class width ____.   Increases
29. In hypothesis testing if the null hypothesis is rejected   the evidence supports the alternative hypothesis
30. In regression analysis, if the dependent variable is measured in dollars, the independent variable   can be any units
31. In regression analysis, the variable that is being predicted is the   dependent variable
32. In regression analysis, which of the following is NOT a required assumption about the error term ε?    The expected value of the error term is 0, The values of the error term are independent, and The variance of the error term is the same for all values of x.
33. In the hypothesis testing procedure, α is   the level of significance
34. In the past, 25% of the town residents participated in the school board elections. The town officials recently undertook an extensive campaign to encourage registered voters to participate in the election process. They are interested in determining whether the promotional campaign actually increased the proportion of voters. The correct set of hypotheses is   H0: p ≤ .25; Ha: p > .25
35. 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 correct set of hypotheses is  H0: p ≤ .75 Ha: p > .75
36. Interpret the z-score as discussed in class   The data point 32 us 1.5 standard deviations below the mean
37. Larger values of the standard deviation result in a normal curve that is     wider and flatter
38. Of those students who are majoring in Business, what percentage plans to go to graduate school?   27.8%
39. Quantitative data that measure “how many” are _____, quantitative data that measure “how much” are _____.   discrete; continuous
40. Regression analysis is a statistical procedure for developing a mathematical equation that describes how   one dependent and one or more independent variables are related
41. Statistical studies in which researchers contrl variables are _____ studies   Experimental
42. Suppose a preliminary screening is given to prospective student athletes at a university to determine whether they would qualify for a scholarship. The scores are approximately normal with a mean of 85 and a standard deviation of 20. If the range of possible scores is 0 to 100, what percentage of students has a score less than 85?   50%
43. Suppose annual salaries for sales associates from Hayley’s Heirlooms have a bell-shaped distribution with a mean of $32,500 and a standard deviation of $2,500. The z-score for a sales associate from this store who earns $37,500 is _____.   2
44. Suppose x is a normally distributed random variable with a mean of 5 and a variance of 4. The probability that x is greater than 10.52 is    .0029
45. The academic planner of a university thinks that at least 35% of the entire student body attends summer school. The correct set of hypotheses to test his belief is   H0: p ≥ .35 Ha: p < .35
46. The assembly time for a product is uniformly distributed between 6 and 10 minutes. The expected assembly time (in minutes) is    8
47. The emperical rule states that, for having a bell-shaped distribution, the portion of data values being within +/- one standard deviation of the mean is approximately _____.   68%
48. The highest point of a normal curve occurs at    the mean
49. The interquartile range is the difference between the ___   First and third quartiles
50. The level of significance in hypothesis testing is the probability of   rejecting a true null hypothesis
51. The life expectancy of a particular brand of tire is normally distributed with a mean of 40,000 and a standard deviation of 5,000 miles.Refer to Exhibit 6-6. What is the random variable in this experiment?   Life expectancy of this brand of tire
52. The mean of a sample is   computed by summing all the data values and dividing the sum by the number of items
53. The mean, median, and mode have the same value for which of the following probability distributions?   Normal
54. The measure of central location most often reported for annual income and property value data is the   median
55. The measure of variability easiest to compute, but seldom used as the only measure, is the   range
56. The percent frequency of industries that are classified as electronics is _____.   20%
57. The rejection region for a one-tailed hypothesis test   is in the tail that supports the alternative hypothesis
58. The sample variance   could be smaller, equal to, or larger than the true value of the population variance
59. The school’s newspaper reported that the proportion of students majoring in business is at least 30%. You plan on taking a sample to test the newspaper’s claim. The correct set of hypotheses is    H0: p ≥ .30 Ha: p < .30
60. The standard deviation (s) is ____   4,062
61. The standard deviation of a standard normal distribution   is always equal to 1
62. The variance of a sample of 81 observations is 64. The standard deviation of the sample is which of the following?   8
63. The variance of a sample or a population cannot be   negative
64. The weight of football players is normally distributed with a mean of 200 pounds and a standard deviation of 25 pounds.Refer to Exhibit 6-3. What is the minimum weight of the middle 95% of the players?    151
65. The weight of items produced by a machine is normally distributed with a mean of 8 ounces and a standard deviation of 2 ounces.Refer to Exhibit 6-5. What percentage of items will weigh at least 11.7 ounces?   3.22%
66. What is the relative frequency for Management Majors?   40%
67. What percentage of the students do not plan to go to gradute school?   65%
68. When the p-value is used for hypothesis testing, the null hypothesis is rejected if   p-value ≤ α
69. Which of the following is an example of quantitative data?   The number of people in a waiting room
70. Which of the following is NOT a measure of location?   Variance
71. Which of the following sum of squares statements is correct for a regression analysis?    SST = SSR + SSE
72. Which of the following symbols represents the size of a population?   N
73. Which of the following types of relationships between a dependent variable y and an independent variable x is represented by a population regression line that resembles a horizontal line?  No linear relationship between the mean value of y and x

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