Use the sample data and confidence level given below to complete parts​ (a) through​ (d).   In a study of cell phone use and brain hemispheric​ dominance, an Internet survey was​ e-mailed to 2325 subjects randomly selected from an online group involved with ears. 1128 surveys were returned. Construct a 95​% confidence interval for the proportion of returned surveys.   a) Find the best point estimate of the population proportion p.   ​b) Identify the value of the margin of err

Q: Find the margin of error at a 90% confidence level.

A:

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A: Two different customer groups:Loyalty program ()No Loyalty program ()35284032383045293731

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Q: random sample of eight ​people, the mean driving distance to work was 23.6 miles and the standard…

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Q: Calculate the lower endpoint of a two-sided 95% confidence interval for the population mean using…

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A: From the provided information, Margin of error (E) = 0.02 Confidence level = 90%

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A: Given data :  n = 21 Average  students  = 3.27 SD = 0.40 9% of CI

Q: Find level of significance for 95% confidence level.

A: Given: Confidence level = 95% = 0.95

2-Proportion Test

In a 2-proportion test, two separate proportions are measured at the same time, and their similarity is evaluated. It is also known as a 2-proportion z-test, and a comparison of two different proportions is done in this method.