I am certain about the answers highlighted green. I am having some issues with t

Question

I am certain about the answers highlighted green. I am having some issues with the other ones. Please help!

1. Confidence interval for mean when sigma is known uses a. t-distribution b. F-distribution c. normal distribution d. Chi-square distribution 2. As the sample size increases, the a. b. c. d. population mean increases standard error of the mean increases standard deviation of the population decreases standard error of the mean decreases 3. The closer the sample mean is to the population mean a. the larger the sampling error b. the smaller the sampling error c. the sampling error equals1 d. None of these alternatives is correct 4. Four hundred people were asked whether gun laws should be more stringent. Three hundred said "yes," and 100 said "no." The point estimate of the proportion in the population who will respond "yes is a. 0.25 b. 300 d. approximately 300

Explanation / Answer

1. Normal distribution option C

2. D standard error decreases

3. B , sampling error is low when sample mean is very close to population mean

5. C TRUE

7. D decreases, because standard error is (standard deviation)/sqrt(N)

10. This is called population . C

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