State the null and alternative hypothesis for each of the following scenarios a

Question

State the null and alternative hypothesis for each of the following scenarios

a sports analyst is testing his claim that the mean weight of this year’s NFL linemen is heavier than in the past years. Suppose that over the past five years, the mean weight linemen was 320.0 pounds

Austin’s company manufactures test tubes . he needs his tubes to be exactly 4.0 mm in diameter. If they are too narrow or too wide, he must recalibrate his machine. Austin randomly measured 150 tubes off the production line in order to perform a hypothesis test

Explanation / Answer

a)

Null Hypothesis: H0: The mean weight of this year’s NFL linemen is not heavier than in the past years

Alternative Hypothesis: H1: The mean weight of this year’s NFL linemen is heavier than in the past years

b)

Null Hypothesis: H0: Austin's company maufactures test tubes are equal to 4.0 mm diameter

Alternative Hypothesis: H1: Austin's company maufactures test tubes are not equal to 4.0 mm diameter

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