02 May 5. In Alaska, A Random Sample Of 15 Eight-Grade Students Has A Mean Score Of 265 With A Sample Standard Deviation …
5. In Alaska, a random sample of 15 eight-grade students has a mean score of 265 with a sample standard deviation of 55 on a national mathematical assessment test. This prompts a state school administrator to declare that the mean score is more than 260. At a five percent significance level, is there enough evidence to support the administrator’s claim? Assume the population standard deviation is unknown; use the “t” procedure. (6 points)
6. In a simple random sample of 42 Alaskan civil engineering firms the mean number of employees is sixteen. The population standard deviation is estimated to be four employees. Establish the 95.5% confidence interval for the population mean. Assume the population standard deviation is known; use the “z” procedure. (5 points)
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