MGMT 1050 Chapter 12: Chapter 12 - Inference About a Population
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12. 1: inference about a population mean when the standard deviation is unknown. Unrealistic to assume that you know population mean and population standard deviation. Cannot use the z test, but rather you use the t test (sample mean and sample standard deviation) T-statistic: used when the population mean and population standard deviation is unknown t m-= n x s. U=population mean, can be determined through null hypothesis. Degrees of freedom: used to determine the rejection region v) Confidence interval estimator: same as population standard dev formula, but replace population standard dev with sample standard dev (notated as wants to determine if newspaper collection from each household exceeded 2. 0 pounds. In a random sample of 148 households, the mean was 2. 18 and the sample standard deviation was. Rejection region: t> t (0. 01, 147) = 2. 351. Since 2. 23 is not greater than 2. 351, we cannot reject the null hypothesis. Note: two tail rejection regions, there is no negative left side rejection region.
