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# Test 11B - Test 11B AP Statistics Name Directions Work on...

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Test 11B AP Statistics Name: Directions: Work on these sheets. Tables and formulas appear on a separate sheet. Part 1: Multiple Choice. Circle the letter corresponding to the best answer. 1. You want to compute a 90% confidence interval for the mean of a population with unknown population standard deviation. The sample size is 30. The value of t* you would use for this interval is (a) 1.96 (b) 1.645 (c) 1.699 (d) .90 (e) 1.311 (f) None of the above 2. A 95% confidence interval for the mean reading achievement score for a population of third-grade students is (44.2, 54.2). The margin of error of this interval is 3. The effect of acid rain upon the yield of crops is of concern in many places. In order to determine baseline yields, a sample of 13 fields was selected, and the yield of barley (g/400m 2 ) was determined. The output from SAS appears below: QUANTILES(DEF=4) EXTREMES N 13 SUM WGTS 13 100% MAX 392 99% 392 LOW HIGH MEAN 220.231 SUM 2863 75% Q3 234 95% 392 161 225 STD DEV 58.5721 VAR 3430.69 50% MED 221 90% 330 168 232 SKEW 2.21591 KURT 6.61979 25% Q1 174 10% 163 169 236 USS 671689 CSS 41168.3 0% MIN 161 5% 161 179 239 CV 26.5958 STD MEAN 16.245 1% 161 205 392 A 95% confidence interval for the mean yield is:

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