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Mathematics, 05.05.2020 16:16, bskyeb14579
A researcher collects crash data at 12 intersections in NYC and found an average crash Due: Wednesday, 12/6 rate of 4.76 crashes/year with a standard deviation of 0.47 crashes/year a. Is the crash data at these 12 intersections different than the city average of 4.56 crashes/year at a 20% level of significance? Define your null and alternative hypothesis. Show your work. b. Is the crash data at these 12 intersections different than the city average of 4.56 crashes/year at a 5% level of significance? Define your null and alternative hypothesis. Show your work.
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Mathematics, 21.06.2019 23:30, ivan2076
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Mathematics, 22.06.2019 03:50, jescanarias22
Arandom sample of n = 25 observations is taken from a n(Β΅, Ο ) population. a 95% confidence interval for Β΅ 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 β Ξ±)% needed.
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A researcher collects crash data at 12 intersections in NYC and found an average crash Due: Wednesda...
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