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Stats Professor Exam 1
12. I use an excel spread sheet to record all of my students’ grades. The spread sheet calculates and reports the mean and median for each exam. While reviewing the scores for exam two, I notice that the mean is 71.8 and the median is 74.2. What type of distribution most likely describes the shape of the test scores: skewed left, skewed right, or symmetric?
14. A list of home values (in thousands) is given. The list was obtained from a random selection of condos in Deerfield Beach, FL: $35, $128, $55, $45, $75, $62, $423. If you wanted to use this data to find a measure of the center to describe the typical cost of a condo in Deerfield Beach, what measure would be best to choose (mean, median, or mode)?
20. After analyzing several large samples from the population of Quality Cola “12 oz” cans, company researchers have concluded that the distribution of actual soda can volumes is mound shaped and symmetric. The cans appear to have an average volume of 11.8 ounces and a standard deviation of 0.72 ounces. Give an interval of volumes that will contain approximately 95% of the population of Quality Cola cans.