# ex_0524 - Exercise on May24 1 Question 1 A sample of 10...

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Exercise on May24. 1. Question 1: A sample of 10 unfurnished one-bedroom apartments in the north area of the city shows a sample mean rent of \$540 per month. Assume the standard deviation is \$80. Find the 95% confidence interval for the mean monthly rent for all unfurnished one-bedroom apartments in the north area. A) \$540 \$80 B) \$540 \$50 C) \$540 \$157 D) \$540 \$25 Question 2: Suppose you are comparing the south and north areas of your city. The south area has an average rent of \$600 per month for a similar sized apartment. Would you conclude that the north area has a higher average monthly rent for the same size apartment? A) Yes B) No Question 3: Which of the following would result in an increased margin of error? A) Increasing the sample size. B) Increasing the confidence level. C) Using a smaller standard deviation. D) Using a larger sample mean. Question 4: In order to have a margin of error equal to \$40, what should the new sample size be? for sample sizes, you can only round up. A) approx 4 B) approx 11

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C) approx 16 D) approx 1.5 2. A survey of 20 restaurants in the Boulder area showed the average cost for a typical meal is 4.19(quarter-pound cheeseburger, large fries, medium soft
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