1, A simple random sample of 60 items resulted in a sample mean of 80. The population standard deviation is = 15.

a. Compute the 95% confidence interval for the population mean (to 1 decimal).

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b. Assume that the same sample mean was obtained from a sample of 120 items. Provide a 95% confidence interval for the population mean (to 2 decimals).

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c. What is the effect of a larger sample size on the margin of error? SelectIt increasesIt decreasesIt stays the sameIt cannot be determined from the given data

The mean cost of a meal for two in a mid-range restaurant in Tokyo is $40 (Numbeo.comwebsite, December 14, 2014). How do prices for comparable meals in Hong Kong compare? the costs for a sample of 42 recent meals for two in Hong Kong mid-range restaurants.

a. With 95% confidence, what is the margin of error (to 2 decimals)?

b. What is the 95% confidence interval estimate of the population mean (to 2 decimals)?

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c. How do prices for meals for two in mid-range restaurants in Hong Kong compare to prices for comparable meals in Tokyo restaurants?

The mean cost of comparable meals in Hong Kong is SelectlessmoreItem 4 than in Tokyo.

he International Air Transport Association surveys business travelers to develop quality ratings for transatlantic gateway airports. The maximum possible rating is 10. Suppose a simple random sample of 50 business travelers is selected and each traveler is asked to provide a rating for the Miami International Airport. The ratings obtained from the sample of 50 business travelers follow.

6 4 6 8 7 7 6 3 3 8 10 4 8

7 8 7 5 9 5 8 4 3 8 5 5 4

4 4 8 4 5 6 2 5 9 9 8 4 8

9 9 5 9 7 8 3 10 8 9 6

Develop a 95% confidence interval estimate of the population mean rating for Miami (to 2 decimals).

95% Confidence:

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