Statistics 102 Quiz 1 Practice

# Statistics 102 Quiz 1 Practice - test for the same data....

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Stat 102 Practice Quiz 1. The 95% confidence interval for the population mean i. is a random interval symmetric around the sample mean. ii. Is a random interval symmetric around the population mean iii. has width proportional to the sample standard deviation iv. has width inversely proportional to the sample standard deviation a. i. and iii. b. i. and i.v. c. ii. and iii. d. ii. and i.v. e. none of the above. 2. In a two-sample comparison problem, which of the following quantities can not be computed from the data? a. ° 1 b. ± 1 − ± 2 c. Degree of freedom in unpooled t-test d. Standard deviation of ± 1 − ± 2 e. All of the above can be computed from the data.

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3. The p-value for a one-sided test is i. always smaller than the p-value for a two-sided test for the same data. ii. sometimes smaller than the p-value for a two-sided
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Unformatted text preview: test for the same data. iii. Equal to half of the p-value for a two-sided test for the same data. iv. Equal to twice the p-value for a two-sided test for the same data. a. i. only b. ii. only c. i. and iii. d. i. and iv. e. None of the above. 4. Consider a data set with the following summaries: Sample size: 100 = 0.35 S = 1.36 i. The data has heavier tails than expected under normal. ii. The data has lighter tails than expected under normal. iii. A t-test for the null hypothesis of zero population mean should reject at the 5% level. iv. A t-test for the null hypothesis of zero population mean should not reject at the 5% level. a. i. and iii. b. ii. and iii. c. i. and iv. d. ii. and iv....
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## This note was uploaded on 04/04/2012 for the course STAT 102 taught by Professor Shaman during the Spring '08 term at UPenn.

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Statistics 102 Quiz 1 Practice - test for the same data....

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