Use the given confidence interval to find the margin of error and the sample mean. (13.6,22.8)
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Use the given confidence interval to find the margin of error and the sample mean. (13.6,22.8)
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Find the critical value tc for the confidence level c equals=0.90 and sample size n equals=18 LOADING… Click the icon to view the tdistribution table. Use a tdistribution table to look up the tvalue using the level of confidence c and the degrees of freedom nminus−1. The level of confidence c equals=0.90 is given.
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A random sample of 75 eighth grade students’ scores on a national mathematics assessment test has a mean score of 278. This test result prompts a state school administrator to declare that the mean score for the state’s eighth graders on this exam is more than 275. Assume that the population standard deviation is 36. At alphaequals0.12, is there enough evidence to support the administrator’s claim? Complete parts (a) through (e).
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