1. What type of error occurs if you fail to reject (aka "accept") H₀ when, in fact, it is not true?

a. type I

b. type II

c.either Type I or Type II, depending on the level of significance

d. either Type I or Type II, depending on whether the test is one-tailed or two-tailed

2. For a given sample size in hypothesis testing,

a.the smaller the Type I error, the larger the Type II error will be.

b.Type II error will not be effected by Type I error.

c.the smaller the Type I error, the smaller the Type II error will be.

d.the sum of Type I and Type II errors must equal to 1.

3. A sample of 64 account balances from a credit company showed an average daily balance of $1040.

The standard deviation of the population is known to be $200. We are interested in determining if the mean of all account balances (i.e., population mean) is significantly different from $1000.

Compute the test statistic.

(note: enter answer as a number with two decimal places - such as 2.77 or 0.95"

4. A sample of 64 account balances from a credit company showed an average daily balance of $1040.

The standard deviation of the population is known to be $200. We are interested in determining if the mean of all account balances (i.e., population mean) is significantly different from $1000.

Which of the following is true?

a. The Null Hypothesis can be rejected at the 2.5% significance level

b. The Null Hypothesis can be rejected at the 10% significance level

c.The Null Hypothesis cannot be rejected at the 5% significance level

d.he Null Hypothesis cannot be rejected at the 20% significance level

5. What type of error occurs if you fail to reject H₀ when, in fact, it is not true?

a. Type II

b. type I

c.either Type I or Type II, depending on the level of significance

d. either Type I or Type II, depending on whether the test is one tail or two tail

6. An assumption made about the value of a population parameter is called a

a. hypothesis

b.conclusion

c.confidence

d. signifance

7. A Type II error is committed when

a.true alternative hypothesis is mistakenly rejected

b. a true null hypothesis is rejected

c.the sample size has been too small

d.not enough information has been available

8. If a hypothesis is rejected at 95% confidence, it

a.will always be accepted at 90% confidence

b. will always be rejected 99% confidience

c.will sometimes be rejected at 90% confidence

d. None of these alternatives is correct.

9. Read the Z statistic from the normal distribution table and circle the correct answer. A one-tailed test (upper tail) at 87.7% confidence; Z =?

a.1.54

b. 1.96

c.1.645

d.1.16

10. For a two-tailed test, a sample of 20 at 80% confidence, t =

a. 1.328

b.2.539

c.1.325

d.2.528

11. In hypotheses testing,

a. the sum of Type I and Type II errors must add up to 1

b. Type II is always twice as large as Type I error

c. the probability of Type I error is

d. type II error is B

12. The average hourly wage of computer programmers with 2 years of experience has been $21.80. Because of high demand for computer programmers, it is believed there has been a significant increase in the average wage of computer programmers. To test whether or not there has been an increase, the correct hypotheses to be tested are?

a. H₀: < 21.80 H_a: 21.80

b.H₀: = 21.80 H_a: 21.80

c. H₀: > 21.80 H_a: 21.80

d. H₀: 21.80 H_a: > 21.80

13. n = 36= 24.6S = 12H₀:20H_a:> 20- The test statistic is?

a. 2.3

b. 0.38

c.-2.3

d. -0.38

14.

n = 36	= 24.6	S = 12	H0:20
			Ha:> 20

The p-value is between? this is number 14!

a. 0.005 to 0.01

b.0.01 to 0.025

c.0.025 to 0.05

d. 0.05 to 0.10

15.

n = 36	= 24.6	S = 12	H0:20
			Ha:> 20

This is number 15!^ If the test is done at 95% confidence, the null hypothesis should

a. not be rejected

b. be rejected

c. not enough information

d. none of these

16. A random sample of 100 people was taken. Eighty-five of the people in the sample favored Candidate A. We are interested in determining whether or not the proportion of the population in favor of Candidate A is significantly more than 80%. The test statistic is?

a.0.80

b.0.05

c.1.25

d.2.00

17. A random sample of 100 people was taken. Eighty-five of the people in the sample favored Candidate A. We are interested in determining whether or not the proportion of the population in favor of Candidate A is significantly more than 80%. The p-value is?

a. 0.2112

b. 0.05

c.0.025

d.0.1056

18. 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 $8,300 per day. From past information, it is known that the standard deviation of the population is $1,200. The correct null hypothesis for this problem is?

a. < 8000

b. u> 8000

c.u=8000

d. u>8250

19. 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 $8,300 per day. From past information, it is known that the standard deviation of the population is $1,200.The value of the test statistic is?

a.250

b.8000

c.8250

d.2.0

20. 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 $8,300 per day. From past information, it is known that the standard deviation of the population is $1,200. the p value is?

a.2.00

b.0.9772

c.0.0228

d. 0.5475

I DONT NEED ANY EXPLANATIONS!