MGMT650 Week 7 Practice Latest 2021 July

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MGMT650 Statistics for Managerial Decision Making

Practice Week 7

Question 1For a 90% confidence interval for a population parameter, e.g., the population mean, of all possible confidence intervals, how many will contain the true parameter value? Enter answer with 2 decimal places.

Question 2A sample of size 25 is selected from a normally distributed population. The sample standard deviation is 4.600. What is the standard error of the distribution of sample means? Enter your answer with 3 decimal places.

Question 3To compute a confidence interval for the mean, population standard deviation unknown, n = 35, and α = 0.01, enter the critical value with 3 decimal places.

Question 4To compute a confidence interval for the mean, population standard deviation unknown, n = 25, and α = 0.10, enter the critical value with 3 decimal places.

Question 5As the confidence level decreases, the confidence interval width

Increases

Decreases

Stays the same

Question 6As the sample size decreases, confidence interval width

Decreases

Increases

Stays the same

Question 7A sample of 10 widgets has a mean of 36.000 and standard deviation of 7.350. At 90% confidence, the lower limit with 3 decimal places is

Question 8A sample of 18 widgets has a mean of 45.500 and standard deviation of 9.450. At 99% confidence, the upper limit with 3 decimal places is

Question 9A statistics course has 22 students in which 73% passed. At 95% confidence, the upper confidence limit for the proportion students passing with 3 decimal places is

Question 10A statistics course has 19 students in which 82.0% passed. At 90% confidence, the lower confidence limit for the proportion students passing with 3 decimal places is

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