exam 2 review - STA 2023 Practice Questions Chapter 7 -...

Info iconThis preview shows pages 1–4. Sign up to view the full content.

View Full Document Right Arrow Icon
STA 2023 Practice Questions Chapter 7 - Chapter 8 Sec. 2 Memorize these Formulas: General Format for Confidence Interval – estimator +/- (t or z) est. standard error General Format of Test Statistic -- # ( ) o estimator from H t or z estimate of stderr - = Make sure you know how to get the sample size for a one sample proportion and a one sample mean problem. Practice Problems on next page.
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
1. You take a random sample from some population and form a 96% confidence interval for the population mean, μ. Which quantity is guaranteed to be in the interval you form? a) 0 b) μ c) x d) .96 2. Suppose you conduct hypothesis test for the population proportion and your p-value is .184. Given a 0.10 level of significance, which of the following should be your conclusion? a) accept H O b) accept H A c) Fail to reject H A d) Fail to reject H O e) Reject H o 3. Decreasing the sample size, while holding the confidence level the same, will do what to the length of your confidence interval? a) make it bigger b) make it smaller c) it will stay the same d) cannot be determined from the given information 4. Decreasing the confidence level, while holding the sample size the same, will do what to the length of your confidence interval? a) make it bigger b) make it smaller c) it will stay the same d) cannot be determined from the given information 5. If you increase the sample size and confidence level at the same time, what will happen to the length of your confidence interval? a) make it bigger b) make it smaller c) it will stay the same d) cannot be determined from the given information 6. Which of the following is a property of the Sampling Distribution of x ? a) if you increase your sample size, x will always get closer to μ, the population mean. b) the standard deviation of the sample mean is the same as the standard deviation from the original population σ. c) the mean of the sampling distribution of x is μ, the population mean. d) x always has a Normal distribution.
Background image of page 2
7. Which of the following is true about p-values? a) a p-value must be between 0 and 1. b) if a p-value is greater than .01 you will never reject H O. c) p-values have a N(0,1) distribution d) None of the above are true. 8. Suppose that we wanted to estimate the true average number of eggs a queen bee lays with 95% confidence. The margin of error we are willing to accept is 0.5. Suppose we also know that s is about 10. What sample size should we use? a) 1536 b) 1537 c) 2653 d) 2650 9. What should be the value of z used in a 93% confidence interval? a) 2.70 b) 1.40 c) 1.81 d) 1.89 10. “What are the possible values of x-bar for all samples of a given n from this population?” To answer this question, we would need to look at the: a. test statistic b. z-scores of several statistics c. standard normal distribution d. sampling distribution e. probability distribution of x 11. Why do we use inferential statistics?
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 4
This is the end of the preview. Sign up to access the rest of the document.

Page1 / 16

exam 2 review - STA 2023 Practice Questions Chapter 7 -...

This preview shows document pages 1 - 4. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online