Posted by **Shawn** on Friday, October 3, 2008 at 3:08pm.

A sample of 64 observations is selected from a normal population. the sample mean is 215 and the standard deviation is 15. conduct the following test of hypothosis using the .3 significance level.

Ho:u > or = 220

H1: u < 220

a) Is this a 1 tailed or 2 tailed test?

b) State the decision rule.

c) Compute the value of the test statistic.

d) What is your decision regarding the H0

e) What is the P value? Interpert

- Statistics -
**MathGuru**, Saturday, October 4, 2008 at 10:59am
A few hints to get you started:

1. If H1 shows a specific direction, the test is one-tailed. If H1 does not show a specific direction (could be in either tail of the distribution curve), the test is two-tailed.

2. Use a one-sample z-test formula to determine the test statistic.

3. The p-value is the actual level of the test statistic which can be determined using a z-table.

4. Determine the critical or cutoff value to reject Ho using a z-table. If the test statistic exceeds the critical value from the table, reject Ho. If the test statistic does not exceed the critical value from the table, do not reject Ho.

I hope this will help.

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