The manager of a grocery store has taken a random

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2. The manager of a grocery store has taken a random sample of 100 customers. The average length of time it took the customers in the sample to check out was 3.1 minutes. The population mean is 3.5 minutes and the population standard deviation is known to be 0.5 minutes. We would like to know if there is evidence of a change in average check out time. Explain in the context of this question what a type 1 error would be: (you do not need to solve the entire problem, just explain the error in the context of the problem) 5 points.3 An Employee Benefits Research Institute survey of 1250 workers over the ages of 25 collected opinions on the health care system in America and on retirement planning. The American health care system was rated as poor by388 of the respondents. What is the point estimateof the population proportion of workers over 25 who rate the American health care system as poor. (2 points)5
PART 3- USING AND INTERPRETING EXCEL: Download the data file from the M drive: 1. Ulrieke is teaching two partially online sections of statistics, L73 that meets at 10am and L74 that meets at 11:30am. The data in the first worksheet provide the results of the first test for both sections. Analyze the data to determine whether there is a significant difference in test performance between the two sections. You can assume that the variances are equal. (10 possible marks)Value of calculated (observed) test statistic: _____________________________Critical value(s): ______________________________________Statistical Decision: __________________________________________________Managerial conclusion:6
2. A random sample of 36 magazine subscribers is taken to estimate the population mean age of all subscribers. The data from the sample are in the second worksheet named “Question 2”. Construct a90% confidence interval estimate of the population mean age of all magazine subscribers. ( 6 points)7

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