exam 2 review

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

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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.

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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? 3. Decreasing the sample size, while holding the confidence level the same, will do what to the length of your confidence interval? 4. Decreasing the confidence level, while holding the sample size the same, will do what to the length of your confidence interval? 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 ?
7. Which of the following is true about p-values? 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?

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