Last year a bill was passed. Of those who voted, 40 people gave two pieces of information: if they voted yes or no and their height (in inches). Assuming the samples were drawn from populations with the same population variance, find the 95% confidence interval for the difference in means of heights.

Question 3. Suppose that the insurance companies did do a survey. They randomly surveyed 400 drivers and found that 320 claimed they always buckle up. We are interested in the population proportion of drivers who claim they always buckle up. (a) Construct a 75% confidence interval for the population proportion who claim they always buckle up and write the interpretation (Sketch the graph). (b) Which distribution you used for this problem? Explain your choice.

When forming a confidence interval for matched-pair data the point estimate is the Select one: O A. standard deviation of the differences. OB. differences of the standard deviations. O C. mean of the differences. O D. difference of the means.

Given two independent random samples with the following results: n₁ = 16 n₂ = 8 x₁ = 94 X2: $₁ = 16 = 124 $2 = 28 Use this data to find the 90% confidence interval for the true difference between the population means. Assume that the population variances are equal and that the two populations are normally distributed. Copy Data Step 2 of 3: Find the margin of error to be used in constructing the confidence interval. Round your answer to six decimal places.

If n=11, 7(x-bar)=45, and s=5, construct a confidence interval at a 95% confidence level. Assume the data came from a normally distributed population. Give your answers to one decimal place.

create a 90% confidence interval for the following data:  x = 25 n = 100

Researchers studied the mean egg length (in millimeters) for a bird population. After taking a random sample of eggs, they obtained a 95% confidence interval of (45,60). What is the value of the margin of error? Choose the correct answer below. A. 15 mm B. 52.5 mm O c. 7.5 mm O D. 1.96

If n=22, (x-bar)=34, and s=17, construct a confidence interval at a 99% confidence level. Assume the data came from a normally distributed population. Give your answers to one decimal place.

Question 2: A random sample of 200 observations produced a sample proportion of 0.35. Determine the 98% confidence interval for the population proportion. rt Answer:

In the construction of an 88% Confidence Interval for a population mean u, a has the value of