Elementary Statistics Chapter 6 Test B

# Elementary Statistics Chapter 6 Test B - Elementary...

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Elementary Statistics Chapter 6 Test - Form B Name:___________________________ Course Number: __________ Section Number: _____ SHORT ANSWER. Write the word or phrase that best completes each statement or answers the question. Provide an appropriate response. 1) Give two reasons the sample mean is the best point estimate for m. 2) Interpret the following 95% confidence interval for mean weekly salaries of shift managers at Guiseppe's Pizza and Pasta. 325.80 < m < 472.30 3) What is the best point estimate for the population proportion? Explain why that point estimate is best. 4) Draw a diagram of the chi-square distribution. Discuss its shape and values. MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. Solve the problem. 5) Find the critical value za/2 that corresponds to a degree of confidence of 91%. A) 1.645 B) 1.75 C) 1.70 D) 1.34 Express the confidence interval in the form of p^± E. 6) -0.056 < p < 0.964 A) p^ = 0.454 ± 0.4 B) p^ = 0.454 ± 0.51 C) ^ p = 0.454 ± 0.3 D) p^ = 0.51 ± 0.4 Find the margin of error for the 95% confidence interval used to estimate the population proportion. 7) n = 390, x = 50 A) 0.0299 B) 0.0332 C) 0.0398 D) 0.0349 Use the given degree of confidence and sample data to construct a confidence interval for the population proportion p. 8) n = 60, x = 26; 95 percent A) 0.327 < p < 0.539 B) 0.308 < p < 0.558 C) 0.307 < p < 0.559 D) 0.328 < p < 0.538

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Find the minimum sample size you should use to assure that your estimate of p^ will be within the required margin of error around the population p. 9) Margin of error: 0.07; confidence level: 95%; from a prior study, p^ is estimated by the decimal equivalent of 91%. A) 195 B) 57 C) 5 D) 65 1 Elementary Statistics Chapter 6 Test - Form B Solve the problem.
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