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March 29, 2015

March 29, 2015

Posted by **please help** on Saturday, March 16, 2013 at 12:15am.

Scores for a random sample of 3000 students had a xbar = 250 with a standard error 1.0

The 99% confidence interval for the mean score all students in the city is 247.4 to 252.6.

Ques: Is there good evidence that the mean for all students in the city is less than the basic level?

Ans: 243 is not in the 99% confidence level. It is below.

The answer in the back of the book says:"we would fail to reject Ho: u=243 against the one-sided alternative hypothesis Ha: u (less than) 243 at the 1% significance level."

I do not understand the book answer "we would fail to reject..."

Does this mean there IS good evidence that the mean is less than the basic level? or NOT?

- math -
**PsyDAG**, Saturday, March 16, 2013 at 2:40pmHo: µ = 243

Ha: µ < 243

I would definitely reject Ha. But since we have only two hypotheses, that would leave me to "fail to reject" Ho. However, I would rather accept Ha: µ > 243, but that was not an included hypothesis.

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