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Unformatted text preview: Test 2a November 14 2003 5:15 6:15 Student Number............................................... Name ............................................................................. Assignment box due Day......................Time............alpha/beta....................... A sheet of yellow paper and a non graphing calculator with no more than two lines of display are the only items allowed to be used for this test. Answers should be correct to 3 significant digits throughout. Write final answers on dotted lines. .......................................................................................................................................... [4] 1. From a sample of 75 gardeners, it was found that 61 of these gardeners plant bulbs in fall. Construct a 98% confidence interval for the proportion of gardeners who plant bulbs in fall. 98% confidence interval is............................ [4] 2 . Find the sample size required to determine the proportion of students who live at home, in order to be 95% confident of being within 0.04 of the true proportion. sample size is ..................................... [10] 3 . The number of kilometers between oil changes was investigated for male and female drivers and the results input to Minitab. Assume that the populations are normally distributed. Two Sample TTest and Confidence Interval Two sample T for male vs female N Mean StDev SE Mean male 8 5754 277 98 female 7 5198 105 40 95% CI for mu male  mu female: ( 315, 797) TTest mu male = mu female (vs >): T = 4.98 P = 0.0001 DF = 13 Both use Pooled StDev = 216 Do a complete hypothesis test at the 1% significance level, using the t test and the Minitab output ....
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 Fall '11
 D.Miners
 Math

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