In a study of cell phone usage and brain hemispheric dominance, an Internet survey was e-mailed to 6998 subjects randomly selected from an online group involved with ears. There were 1313 surveys returned. Use a 0.01 significance level to test 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.

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In a study of cell phone usage and brain hemispheric dominance, an Internet survey was e-mailed to 6998 subjects randomly selected from an online group involved
with ears. There were 1313 surveys returned. Use a 0.01 significance level to test 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.
Transcribed Image Text:In a study of cell phone usage and brain hemispheric dominance, an Internet survey was e-mailed to 6998 subjects randomly selected from an online group involved with ears. There were 1313 surveys returned. Use a 0.01 significance level to test 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.
The test statistic is z= -3.19.
(Round to two decimal places as needed.)
The P-value is 0.001.
(Round to three decimal places as needed.)
Because the P-value is
less than
the significance level, fail to reject the null hypothesis. There is insufficient evidence to support the claim that the return rate
is less than 20%.
Transcribed Image Text:The test statistic is z= -3.19. (Round to two decimal places as needed.) The P-value is 0.001. (Round to three decimal places as needed.) Because the P-value is less than the significance level, fail to reject the null hypothesis. There is insufficient evidence to support the claim that the return rate is less than 20%.
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