This preview has intentionally blurred sections. Sign up to view the full version.
View Full DocumentThis is an unformatted preview. Sign up to view the full document.
View Full DocumentBus Stat Test 3 Practice Test Multiple Choice Identify the choice that best completes the statement or answers the question. ____ 1. The level of significance a. can be any positive value b. can be any value c. is (1 - confidence level) d. can be any value between -1.96 to 1.96 ____ 2. The average life expectancy of tires produced by the Whitney Tire Company has been 40,000 miles. Management believes that due to a new production process, the life expectancy of their tires has increased. In order to test the validity of their belief, the correct set of hypotheses is a. H : < 40,000 H a : 40,000 b. H : 40,000 H a : > 40,000 c. H : > 40,000 H a : 40,000 d. H : 40,000 H a : < 40,000 Exhibit 9-1 n = 36 = 24.6 S = 12 H : 20 H a : > 20 ____ 3. Refer to Exhibit 9-1. If the test is done at 95% confidence, the null hypothesis should a. not be rejected b. be rejected c. Not enough information is given to answer this question. d. None of these alternatives is correct. Exhibit 9-3 n = 49 = 54.8 s = 28 H : = 50 H a : 50 ____ 4. Refer to Exhibit 9-3. The p-value is equal to a. 0.1151 b. 0.3849 c. 0.2698 d. 0.2302 ____ 5. Refer to Exhibit 9-3. If the test is done at the 5% level of significance, the null hypothesis should a. not be rejected b. be rejected c. Not enough information given to answer this question. d. None of these alternatives is correct. 1 Exhibit 9-4 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. ____ 6. Refer to Exhibit 9-4. The standardized test statistic is a. 1.96 b. 1.64 c. 2.00 d. 0.056 ____ 7. For a two-tailed test at 86.12% confidence, Z = a. 1.96 b. 1.48 c. 1.09 d. 0.86 ____ 8. For a one-tailed test (upper tail), a sample size of 18 at 95% confidence, t = a. 2.12 b.-2.12 c.-1.740 d. 1.740 Exhibit 9-6 A random sample of 16 students selected from the student body of a large university had an average age of 25 years and a standard deviation of 2 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. ____ 9. Refer to Exhibit 9-6. At 95% confidence, it can be concluded that the mean age is a. not significantly different from 24 b. significantly different from 24 c. significantly less than 24 d. significantly less than 25 ____ 10. For a one-tailed test (lower tail) at 89.8% confidence, Z = a.-1.27 b.-1.53 c.-1.96 d.-1.64 ____ 11. For a one-tailed test (upper tail), a sample size of 26 at 90% confidence, t = a. 1.316 b.-1.316 c.-1.740 d. 1.740 ____ 12. For a one-tailed test (lower tail), a sample size of 22 at 95% confidence, t = a.-1.383 b. 1.383 c.-1.717 d.-1.721 2 ____ 13. Which of the following statements is ... View Full Document
This preview has intentionally blurred sections. Sign up to view the full version.
View Full DocumentPractice Test 4
Sylabus
Chap 1
Chap 2
Practice Test 1
Chap 3
11 TB Ch12
12 TB Ch13
Practice Test 2
10
08 TB Ch09
05 TB Ch06
Copyright © 2015. Course Hero, Inc.
Course Hero is not sponsored or endorsed by any college or university.