ex1_fa06 - STA 6126 Exam 1 Fall 2006 1 A researcher is...

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STA 6126 – Exam 1 – Fall 2006 1. A researcher is collecting data regarding auctions on Ebay. Are the following variables best described as I nterval, N ominal, or O rdinal scale? a) Product Category (Clothing, Electronice, Auto Parts, Software) _____________ b) Number of bids made during the auction _______________ c) Size of item (Small, Medium, Large, X-Large) _________________ 2. True or False: Sampling error is avoided when we take random samples. _____ 3. True or False: For large samples, estimators of means and proportions have sampling distributions that are approximately normal. ______ 4. True or False: For a distribution that is skewed right, the median will be larger than the mean. ______ 5. True or False: All else being equal, the width of a 95% Confidence Interval for a population mean increases as the sample size increases. _______________ 6. Exam scores on a standardized test are normally distributed with a mean of 830 and a standard deviation of 80. The middle 95% of students taking this exam scored between _________ and _____________

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