ANSWERS_-_exercises_on_confidence_intervals

ANSWERS_-_exercises_on_confidence_intervals - c) The...

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ANSWERS #1. The sample mean is the best estimate because it is more likely to have come from a population with the same mean than from any other population. #2. The range of values that you are 95% confident includes the population mean, estimated based on the scores in a sample. #3. a) Best estimate is the sample mean: 70 b) Standard error of the mean is 2, Lower limit = (-1.96)(2) + 70 = -3.92 + 70 = 66.08; Upper limit = (+1.96)(2) + 70 = 3.92 + 70 = 73.92 The 95% confidence interval is from 66.08 to 73.92
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Unformatted text preview: c) The confidence interval dos not include the mean of the general population (which was 75). Thus, you can reject the null hypothesis that the two populations are the same. #4. a) 95% confidence interval: Z = +/- 1.96; Standard error of the mean = 4.91 Lower limit = (-1.96)(4.91) + 100 = 90.38 Upper limit = (+1.96)(4.91) + 100 = 109.62 b) 99% confidence interval: Z = +/- 2.57; Standard error of the mean = 4.91 Lower limit = (-2.57)(4.91) + 100 = 87.38 Upper limit = (+2.57)(4.91) + 100 = 112.62...
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This note was uploaded on 04/29/2010 for the course PSYCH 315 taught by Professor Afroditipanagopoulos during the Winter '10 term at Concordia Canada.

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