The mean length of steel beams manufactured by a

Reference no: EM13635920

Stating the hypotheses. In each of the following situations a significance test for a population mean Âµ is called for. Identify the null hypothesis H0 and the alternative hypothesis HA in each case. Make sure to use proper notation! (e.g. H0 : Âµ = Âµ0). For each question, all possible options involve Âµ and Â¯x are available.

(a) Last year the mean sales per week in a large department store was $85,492. A manager wants to test the hypothesis that sales have increased since he was promoted.

(b) The mean length of steel beams manufactured by a properly-working machine is 3.2 meters. An industrial engineer wants to make sure that the machine in not operating incorrectly.

(d) The population mean IQ is 100. A psychologist wants to test the hypothesis that a new cognitive treatment increases the IQ of patients who undergo the treatment.

Reference no: EM13635920

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