Hypothesis

Can you please explain the answer to this question ?

An analyst calculates that the mean of a sample of 200 observations is 5. The analyst wants to determine whether the calculated mean, which has a standard error of the sample statistic of 1, is significantly different from 7 at the 5% level of significance. Which of the following statements is least accurate?:

A) The alternative hypothesis would be Ha: mean > 7. B) The mean observation is significantly different from 7, because the calculated Z-statistic is less than the critical Z-statistic. C) The null hypothesis would be: H0: mean = 7.

The analyst wants to know if the mean is different from 7; it could be different by being too big or being too small. Thus, _H_0: μ = 7, Ha: μ ≠ 7.

Thanks S2000magician…

My pleasure.