Create a 75% confidence interval for a population proportion from a sample of size 73 with sample 44 proportion p = 73 [three decimal accuracy] [three decimal accuracy]

random sample of 25 business students required an average of 50.7 minutes to complete a statistics exam. Assume that the population standard deviation to complete the exam was 10.4 minutes. The 99% confidence interval around this sample mean is

In a survey, each participant indicated how much they agreed with the statement, "Hard work is the way to get what you want in life." Which of the following would you expect to have zero correlation, or close to zero correlation, with the response to the above statement? A) Agreement with the statement, "Happiness mostly depends on luck."   B) Conscientiousness score on a personality inventory test.   C) High school GPA.   D) A random number between 0 and 10, chosen by the participant.

If x=76 ₁² = 14 and n=65, Construct a 95% Confidence interval estimate of the population mean, pe الكيك

A sample of 20 cows is drawn to estimate the mean weight of a large herd of cattle.  If the standard deviation of the sample is 96 kg, what is the margin of error in a 90% confidence interval estimate?

A study of 22 goats reveals that the average length of a goat’s tail is 6.3 inches. If the standarddeviation is known to be 1.2 inches find a 95% confidence interval for the mean tail length.

What value of  z-alpha/2   is used in a 90%   confidence interval for the population mean?