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Test 10B - Test 10B probability table is attached AP...

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Test 10B AP Statistics Name: Directions: Work on these sheets. Answer completely, but be concise. A normal probability table is attached. 1. In formulating hypotheses for a statistical test of significance, the null hypothesis is often A) a statement that there is “no effect” or “no difference.” B) the probability of observing the data you actually obtained. C) a statement that the data are all 0. D) 0.05. 2. An agricultural researcher plants 25 plots with a new variety of corn. A 90% confidence interval for the average yield for these plots is found to be 162.72 ± 4.47 bushels per acre. Which of the following would produce a confidence interval with a smaller margin of error than this 90% confidence interval? 3. A small company consists of 25 employees. As a service to the employees, the company arranges for each to have a complete physical for free. Among other things, the weight of each employee is measured; the mean weight is found to be 165 pounds. The population standard deviation is 20 pounds. It is believed that a mean weight of 160 pounds would be normal for this group. To see if there is evidence that the mean weight of the population of all employees of the company differs significantly from 160, the hypotheses H0: μ = 160, Ha: μ > 160 are tested. You obtain a P-value of less than 0.1056. Which of the following is true?

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Test 10B - Test 10B probability table is attached AP...

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