My own answer is

D,D,B,D,D,D,D,C,c,c,d

Am I correct?

1, If an economist wishes to determine whether there is evidence that average family income in a community is at least $25,000

Group of answer choices

A.a lower-tailed test should be utilized

B.a two-tailed test should be utilized

C.either a one-tailed or two-tailed test could be used with equivalent results

D.an upper-tailed test should be utilized

2, Which of the following statements is not true about the level of significance in a hypothesis test?

Group of answer choices

A.The significance level determines the size of the rejection region

B.The larger the level of significance, the more likely you are to reject the null hypothesis

C.The level of significance is the maximum risk we are willing to accept in making a Type I error

D.The level of significance is the maximum risk we are willing to accept in making a Type II error

3, If the level of significance of a hypothesis test is raised from 0.01 to 0.05, the probability of a Type II error

Group of answer choices

A.will increase

B.will decrease

C.will not change

D.will also increase from 0.01 to 0.05

4, Suppose we want to test H₀:30 versus H₁:< 30. Which one of the following possible sample results based on a sample of size 36 is most likely to reject H₀in favor of H₁?

Group of answer choices

A.Sample mean = 26, sample standard deviation = 9

B.Sample mean = 28, sample standard deviation = 6

C.Sample mean = 32, sample standard deviation = 2

D.Sample mean = 27, sample standard deviation = 4

5, We have created a 95% confidence interval for the population mean with the result [10, 15]. What decision will we make if we test H₀:= 16 versus H₁:16 at 5% level of significance?

Group of answer choices

A.Fail to reject H0 in favor of H1

B.Reject H0 in favor of H1

C.Accept H0 in favor of H1

D.We cannot tell what our decision will be from the information given

6, We have created a 95% confidence interval for the population mean with the result [10, 15]. What decision will we make if we test H₀:= 16 versus H₁:16 at 5% level of significance?

Group of answer choices

A.Fail to reject H0 in favor of H1

B.Reject H0 in favor of H1

C.Accept H0 in favor of H1

D.We cannot tell what our decision will be from the information given

7, When determining the sample size for a proportion for a given level of confidence and sampling error, the closer to 0.50 that the population proportion is estimated to be, the __________ the sample size required

Group of answer choices

A.The sample size is not affected

B.The effect cannot be determined from the information given

C.smaller

D.larger

8, We are interested in conducting a study in order to determine what percentage of voters of a state would vote for the incumbent governor. What is the minimum size sample needed to estimate the population proportion with a margin of error of +/-0.05 at 95% confidence?

Group of answer choices

A.385

B.768

C.384

D.769

9, A random sample of 1000 people was taken. Four hundred fifty of the people in the sample favored Candidate A. The 95% confidence interval for the true proportion of people who favors Candidate A is

Group of answer choices

A.0.519 to 0.581

B.0.549 to 0.551

C.0.419 to 0.481

D.0.449 to 0.451

10, A survey claims that 9 out of 10 doctors recommend aspirin for their patients with headaches. To test this claim against the alternative that the actual proportion of doctors who recommend aspirin is not 0.90, a random sample of 100 doctors was selected. Suppose that the test statistic is - 2.20. Can we conclude that H₀should be rejected at the (i) 10%, (ii) 5%, and (iii) 1% level of significance?

Group of answer choices

(i)no; (ii) no; (iii) yes

(i)yes; (ii) yes; (iii) yes

(i)yes; (ii) yes; (iii) no

(i)no; (ii) no; (iii) no

11.Which of the following would be an appropriate alternative hypothesis?

Group of answer choices

(ii)The sample proportion is at most 0.44

(iii)The population proportion is at most 0.44

(iv)The sample proportion is more than 0.44

(v)The population proportion is more than 0.44