# In a study of cell phone usage and brain hemispheric dominance, an Internet survey was e-mailed to 6993 subjects randomly selected from an online group involved with ears. There were 1308 surveys returned. Use a 0.01 significance level totest the claim that the return rate is less than 20%. Use the P-value method and use the normal distribution as an approximation to the binomial distribution.Identify the null hypothesis and alternative hypothesis.В. Но: р3D0.2А. Но: р3D0.2H1:p>0.2H1:p 0.2Е. Но: р

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Asked Dec 8, 2019
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Step 1

From the given information, the claim of the problem is the return rate is less than 20%.

Null hypothesis:

H0p=0.2.

That is, there is no significance evidence that the return rate is less than 20%.

Alternative hypothesis:

H1p<0.2.

That is, there is a significance evidence that the return rate is less than 20%.

The correct option is B. H0p=0.2 and H1p<0.2.

From the given information, in a sample of 6993 respondents, 1308 of them are returned.

The sample size is, n =6993 and x=1308. The sample proportion is   =0.19(=1308/6993)

The test statistic is  ̶ 2.08 and it is calculated below

Step 2

The P-value is 0.019 and it is calcula...

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