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Find the null and alternative hypotheses for this situation: XYZ Corporation has taken a sample of...

Find the null and alternative hypotheses for this situation: XYZ Corporation has taken a sample of 25 former employees and found that the mean length of employment at the corporation before retirement was 21.5 years with a standard deviation of 2.5 years. Management wants to determine whether the mean employment length for all XYZ employees is more than 20 years.

math   Statistics-And-Probability   
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Answer #1

Null Hypothesis Ho: μ = 21.5

Alternative hypothesis Ha : μ > 20

[Null hypothesis means the hypothesis that there is no significant difference between specified populations ,a position that states something is happening, a new theory is true instead of an old one]

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