# Hypothesis testing for populations

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A sample of 100 observations from the first population indicated that x1 is 70. A sample of 150 observations from the second population revealed x2 to be 90. Use the .05 significance level to test the hypothesis.

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#### Solution Preview

The null and alternate hypotheses are:

Ho: = vs. HA:

State the decision rule.

Reject the null hypothesis if z > zalpha = z > z0.05 = 1.645

Compute the pooled proportion.

Compute the value of the test statistic.

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#### Solution Summary

The expert examines hypothesis testing for populations.

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