Mathematics, 26.12.2019 23:31 jhenifelix
The first 10 students who arrived for the friday lecture filled out a questionnaire on their attitudes toward the instructor. the first 10 who were late for the lecture were spotted and afterward filled out the same questionnaire. the appropriate design for testing the significance of the difference between the means is
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Arandom sample of n = 25 observations is taken from a n(µ, σ ) population. a 95% confidence interval for µ was calculated to be (42.16, 57.84). the researcher feels that this interval is too wide. you want to reduce the interval to a width at most 12 units. a) for a confidence level of 95%, calculate the smallest sample size needed. b) for a sample size fixed at n = 25, calculate the largest confidence level 100(1 − α)% needed.
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