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Fall 2006 Test 2 Math 1P98

# Fall 2006 Test 2 Math 1P98 - Test 2a Math 1P98 Friday Nov...

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Test 2a Math 1P98 Friday Nov 10 5:15-6:15 Name ..................................................................... Box ................................. You may bring your empty envelope with one side used as a formula sheet with anything you like hand written on this side. (If a person has used both sides their mark will be cut in half.) The test must be put into the envelope to be handed in. Final answers should have at least 3 significant digits, so more digits must be kept throughout the question . A non-graphing calculator may be used. Good Luck! ........................................................................................................................................... [4] 1a . Construct the 95% confidence interval for the mean time taken for a new customer to find an item in a big box electronics store. A random sample of 35 people were asked and it took a mean time of 22.5 min with standard deviation 6.3 min. [3] b. In order to be 98% confident of being within 0.5 min of the population mean time, how many people would have to be surveyed? [2] c. To investigate whether a greeter would improve the time taken, a temporary greeter was used for a week. You are given two sets of times, for a random sample of 35 people without a greeter and for a random sample of 50 people with a greeter, and asked to analyse them to determine whether a greeter should be used. To do this you would use: ( circle one of the choices) a. a 2- tail hypothesis test b. a confidence interval c. a histogram d. a 1-tail hypothesis test The formula(s) you would use is/are: ( do not substitute numbers)

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[10] 2. Fund raiser hot dog sales took place at the entrance of two grocery stores.
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Fall 2006 Test 2 Math 1P98 - Test 2a Math 1P98 Friday Nov...

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