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The null hypothesis is that the true proportion of the population is equal to .40.A sample...

The null hypothesis is that the true proportion of the population is equal to .40.A sample of 120 observations revealed the sample proportion"p" was equal to .30.At the significance level 5est to see if the proportion is in fact different from .40.what will be the value of the critical value on the left

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Answer #1

Given Information:

Population mean proportion (po) = 0.40

Sample size (n) = 120

Sample proportion (p1) = 0.3

Level of Significance = 0.05

Step 1: Formulate the hypothesis

Step 2: Calculate the test statistic

The one-proportion z test will be used.

Following is the formula:

By referring to the standard normal table, the p-value at z =- -0.8169 is 0.4139

Since the p value is more than the level of significance , the null hypothesis will be accepted. which indicates that there is no change in proportion value.

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