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Title: MTH410 - Module 5 - B - Check Your Understanding Type: Fill in the blank Question: 1. A random sample of 100 credit sales in a department store showed an average sale of $120.00. From past data, it is known that the standard deviation of the population is $40.00. Determine the standard error of the mean. Correct Answer: 4 Correct Feedback: That’s correct! Incorrect Feedback: The correct answer is: 4 Question: 2. A random sample of 100 credit sales in a department store showed an average sale of $120.00. From past data, it is known that the standard deviation of the population is $40.00. With a 0.95 probability, determine the margin of error. Correct Answer: 7.84 Correct Feedback: That’s correct! Incorrect Feedback: The correct answer is: 7.84 Question: 3. A random sample of 100 credit sales in a department store showed an average sale of $120.00. From past data, it is known that the standard deviation of the population is $40.00. What is the 95% confidence interval of the population mean? Correct Answer: 112.16 to 127.84 Correct Feedback: That’s correct! Incorrect Feedback: The correct answer is: 112.16 to 127.84 Question: 4. In order to determine the average weight of carry-on luggage by passengers in airplanes, a sample of 16 pieces of carry-on luggage was weighed. The average weight was 20 pounds. Assume that we know the standard deviation of the population to be 8 pounds. Determine a 97% confidence interval estimate for the mean weight of the carry-on luggage. Correct Answer: 15.66 to 24.34 Correct Feedback: That’s correct! Incorrect Feedback: The correct answer is: 15.66 to 24.34 Question: 5. In order to determine the average weight of carry-on luggage by passengers in airplanes, a sample of 16 pieces of carry-on luggage was weighed. The average weight was 20 pounds. Assume that we know the standard deviation of the population to be 8 pounds. Determine a 95% confidence interval estimate for the mean weight of the carry-on luggage. Correct Answer: 16.08 to 23.92 Correct Feedback: That’s correct! Incorrect Feedback: The correct answer is: 16.08 to 23.92
