Confidence interval for population mean

Reference no: EM1311631

Confidence interval for population mean:

1. Consumption of alcoholic beverages by young women of drinking age has been increasing in the United Kingdom, the United States, and Europe (The Wall Street Journal, February 15, 2006). Data (annual consumption in liters) consistent with the findings reported in The Wall Street Journal article are shown for a sample of 20 European young women.

Excel or Minitab users: The data set is available in file named Alcohol. All data sets can be found in your eBook or on your Student CD.

162	82	199	174	97
170	222	115	115	169
164	98	132	171	0
93	0	93	110	434

Assuming the population is roughly symmetric, construct a 95% confidence interval for the mean annual consumption of alcoholic beverages by European young women (to 1 decimal).

2. The daily car rental rates for a sample of eight cities follow.

City	Daily Car Rental Rate ($)
Atlanta	69
Chicago	72
Dallas	75
New Orleans	67
Phoenix	62
Pittsburgh	65
San Francisco	61
Seattle	59

a. Compute the sample variance and the sample standard deviation for these data (to 2 decimals).

b. What is the 95% confidence interval estimate of the variance of car rental rates for the population (to 1 decimal)?

c. What is the 95% confidence interval estimate of the standard deviation for the population (to 1 decimal)?

Reference no: EM1311631

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