Statistics 102 Quiz 1 Practice Answers

# Statistics 102 Quiz 1 Practice Answers - Stat 102 Practice...

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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. Answer: a. The confidence interval is always symmetric around the sample mean, with width proportional to s . 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

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d. Standard deviation of ° 1 − ° 2 e. All of the above can be computed from the data. Answer: d. The standard deviation of ° 1 − ° 2 is a parameter. It is a quantity that relies on the population standard deviations of each of the two samples. Sample standard deviations, s (choice a), is
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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 Answers - Stat 102 Practice...

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