5RelativeResourceManager

5RelativeResourceManager - s claim. a. Construct the null...

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Part III Review for Test 2 1. It is known that scores on the Stanford-Binet IQ test are normally distributed with a = 100 and a = 16. A sample of 15 had a mean of 102.3. a. Construct a 90 % confidence interval about the mean. Interpret your answer. b. Construct a 95% confidence interval about the mean. Interpret your answer. c. Construct a 99% confidence interval about the mean. Interpret your answer. d. If we want a margin of error no larger than 5, what sample size would I need if I wanted a 95% confidence level. 2. We want to estimate the speed of cars on the highway outside a subdivision where = 7mph. We randomly selected 12 cars and calculated the mean to be 59.62. Construct a 95% Confidence interval. 3. The scores on the Stanford-Binet IQ test are normally distributed with a = 100 and a = 16. A researcher believes the mean has increased from 100. A sample of 15 had a mean of 103.3. At a 0.05 significance level test the researcher
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Unformatted text preview: s claim. a. Construct the null and alternative hypothesis. b. Describe the null hypothesis distribution. c. What is ? d. What is the test statistic? e. What is the p-value? f. Do you reject or not reject H ? g. State your conclusion. h. If the mean of the test is actually 103, did we make an error? If so, which error? 4. It is thought that the mean speed of cars on the highway outside a subdivision is 60 mph and = 7mph. A resident believes that it is higher. 81 cars are randomly selected and calculated the mean to be 61.62. Test the residence claim at a 0.05 significance level. a. Construct the null and alternative hypothesis. b. Describe the null hypothesis distribution. c. What is ? d. What is the test statistic? e. What is the p-value? f. Do you reject or not reject H ? g. State your conclusion. h. If the mean speed of cars is 60 mph, did we make an error? If so, which error?...
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