(a) What is the point estimate of the difference between the two population proportions? (b) Develop a 90% confidence interval for the difference between the two population proportions. (c) Develop a 95% confidence interval for the difference between the two population proportions.

Construct a confidence interval for the mean of the paired differences for the two populations with the following information. Round the endpoints of the interval to three decimal places, if necessary. n=37n=37, d¯=2.191d¯=2.191, α=0.1α=0.1, sd=0.411sd=0.411

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An arborist is interested in determining the mean diameter (in centimeters) of mature white oak trees at a certain height above the base. She measures 7 of these trees and finds the following sample statistics : x̄= 49.09 and s= 13.80. Construct a 95% confidence interval for the mean diameter of a mature white oak tree.

In a random sample of 250 high school students, it was found that 85.2% (213) of them later graduated. Find the 95% and 98% confidence interval for the true proportion of all high school students who graduate. Compare the two proportions.

Calculate the 95% confidence interval and the 99% confidence interval for a sample of 81 where the population has a mean of 50 and a standard deviation of 6.

A small business wanted to estimate the mean income from their customers. They took a sample of 256 customers which yielded a sample mean of $71,250 with a standard deviation of $5,800 . What is the 90% confidence interval estimate for the population mean income of their customers.

You may need to use the appropriate appendix table or technology to answer this question. Consider the following results for independent samples taken from two populations. Sample 1 Sample 2 n1 = 400 n2 = 300 p1 = 0.49 p2 = 0.32 (a) What is the point estimate of the difference between the two population proportions? (Use  p1 − p2. )   (b) Develop a 90% confidence interval for the difference between the two population proportions. (Use  p1 − p2.  Round your answer to four decimal places.)  to  (c) Develop a 95% confidence interval for the difference between the two population proportions. (Use  p1 − p2.  Round your answer to four decimal places.)  to

We have presented a confidence interval (CI) for the difference, μ1 − μ2, between two population means. Interpret each confidence interval. 95% CI is from 15 to 20.

Part 1 of 3  A researcher was investigating the size of math departments in Texas colleges. She believed the population standard deviation was 1.9. A sample of 42 colleges found their mean was 12.5.   Find the 3-decimal small value of the 95% confidence interval of the mean.     Part 2 of 3: Find the 3-decimal large value of the 95% confidence interval of the mean.     Part 3 of 3: Find the 3-decimal margin of error