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: A random sample of n = 200 observations from a binomial population yield

p^=0.29

a. Test H0:p=0.35 against H0:p<0.35. Usea=0.05.

Short Answer

Expert verified

a. Reject the null hypothesis. So, there is enough evidence to claim that the population proportion is less than 0.35, at the a=0.05 significance level.

Step by step solution

01

Given Information

The random sample is taken from the Binomial population.

The sample size, n=200.

The sample proportion,p^=0.29.

02

State the large sample test of the hypothesis about a population proportion

The large sample test of the hypothesis about a population proportion is valid in the two given conditions:

猞 A random sample is selected from a binomial population.

猞 The sample size n is large.

03

Compute the hypothesis test H0:p=0.35 against  H0:p<0.35 at the significance level a=0.05.

The null and alternative hypothesis are:

H0:p=0.35H0:p<0.35

The significance level,a=0.05

The test statistic is,

Z=p^-p0p0q0n=0.29-0.350.35(1-0.35)200=-0.060.0337=-1.7804

This is a one-tailed test. So, the Za corresponding significance level a=0.05obtained from the standard normal table is 1.645.

Here, the rejection region is Zc<-Za-1.7804<-1.645. So, we reject the null hypothesis.

Hence, we reject the null hypothesis. So, there is enough evidence to claim that the population proportion is less than 0.35, at the a=0.05 significance level.

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