STAT
Assignment 6.1

# B based on the data do the students have a legitimate

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this machine. b. Based on the data do the students have a legitimate complaint about the machine not giving them enough coffee on average? c. If the students had taken a random sample of 100 cups (all other info staying the same) how would this affect the margin of error? d. What sample size is needed if the students wanted the margin of error to be at most .02 ounces per cup? 3. To estimate the number of visitors per month to the John F. Kennedy Library, the number of visitors was recorded for randomly selected months. Descriptive statistics on the sample data are shown below. Assume standard deviation for number of visitors stays at 35,000 people. Descriptive Statistics: Visitors Total Variable Count Mean Visitors 36 250926 a. Use the given information to estimate the average number of visitors to the JFK library. b. Using your answer to part a, what would be an unusually average for a given year? What would be an unusually low average number of visitors for a given year? Why? 2

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4. A group of randomly selected 50 sales representatives from a company had an average sales of \$107.5 million this year. (Assume the standard deviation of sales is stable at \$20.5 million.)
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