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1. The standard deviation of...

1. The standard deviation of all possible values is called the

a. standard error of proportion

b. standard error of the mean

c. mean deviation

d. central variation

2. The number of random samples (without replacement) of size 3 that can be drawn from a population of size 5 is

a. 15

b. 10

c. 20

d. 125

3. A sample of 51 observations will be taken from an infinite population. The population proportion equals 0.85. The probability that the sample proportion will be between 0.9115 and 0.946 is

a. 0.8633

b. 0.6900

c. 0.0819

d. 0.0345

4. If the level of significance of a hypothesis test is raised from .01 to .05, the probability of a Type II error

a. will also increase from .01 to .05

b. will not change

c. will decrease

d. will increase

5. The manager of a grocery store has taken a random sample of 100 customers. The average length of time it took the customers in the sample to check out was 3.1 minutes with a standard deviation of 0.5 minutes. We want to test to determine whether or not the mean waiting time of all customers is significantly more than 3 minutes.

A. Refer to Exhibit 5. The standardized test statistic is

a. 1.96

b. 1.64

c. 2.00

d. 0.056

B. Refer to Exhibit 5. The p-value is

a. 0.025

b. 0.0456

c. 0.05

d. 0.0228

C. Refer to Exhibit 5. At 95% confidence, it can be concluded that the mean of the population is

a. significantly greater than 3

b. not significantly greater than 3

c. significantly less than 3

d. significantly greater then 3.18

6. Salary information for a random sample of male and female employees of a large company is shown below.

Male Female

Sample Size 64 36

Sample Mean Salary (in $1,000) 44 41

Sample Variance 128 72

A. Refer to Exhibit 9. The point estimate of the difference between the means of the two populations is

a. -28

b. 3

c. 4

d. -4

B. Refer to Exhibit 9. The standard error for the difference between the two means is

a. 4

b. 7.46

c. 4.24

d. 2.0

C. Refer to Exhibit 9. The 95% confidence interval for the difference between the means of the two populations is

a. 0 to 6.92

b. -2 to 2

c. -1.96 to 1.96

d. -0.92 to 6.92

a. standard error of proportion

b. standard error of the mean

c. mean deviation

d. central variation

2. The number of random samples (without replacement) of size 3 that can be drawn from a population of size 5 is

a. 15

b. 10

c. 20

d. 125

3. A sample of 51 observations will be taken from an infinite population. The population proportion equals 0.85. The probability that the sample proportion will be between 0.9115 and 0.946 is

a. 0.8633

b. 0.6900

c. 0.0819

d. 0.0345

4. If the level of significance of a hypothesis test is raised from .01 to .05, the probability of a Type II error

a. will also increase from .01 to .05

b. will not change

c. will decrease

d. will increase

5. The manager of a grocery store has taken a random sample of 100 customers. The average length of time it took the customers in the sample to check out was 3.1 minutes with a standard deviation of 0.5 minutes. We want to test to determine whether or not the mean waiting time of all customers is significantly more than 3 minutes.

A. Refer to Exhibit 5. The standardized test statistic is

a. 1.96

b. 1.64

c. 2.00

d. 0.056

B. Refer to Exhibit 5. The p-value is

a. 0.025

b. 0.0456

c. 0.05

d. 0.0228

C. Refer to Exhibit 5. At 95% confidence, it can be concluded that the mean of the population is

a. significantly greater than 3

b. not significantly greater than 3

c. significantly less than 3

d. significantly greater then 3.18

6. Salary information for a random sample of male and female employees of a large company is shown below.

Male Female

Sample Size 64 36

Sample Mean Salary (in $1,000) 44 41

Sample Variance 128 72

A. Refer to Exhibit 9. The point estimate of the difference between the means of the two populations is

a. -28

b. 3

c. 4

d. -4

B. Refer to Exhibit 9. The standard error for the difference between the two means is

a. 4

b. 7.46

c. 4.24

d. 2.0

C. Refer to Exhibit 9. The 95% confidence interval for the difference between the means of the two populations is

a. 0 to 6.92

b. -2 to 2

c. -1.96 to 1.96

d. -0.92 to 6.92

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