ind the necessary confidence interval for a population mean u for the following values. (Round your answers to three decimal places a 90% confidence interval, n = 135, x = 0.87, s? = 0.089 %3D

******************* *************** - How large a sample should be selected to provide a 95% confidence interval with a margin of error c 15? Assume that the population standard deviation is 40. ************************ 1 Over the past five years the ******

Mean value of a random sample of 60 items was found to be 145 with standard deviation of 40. Find 95% confidence limits for population mean

random sample of 100 observations is taken from a normal population with a standard deviation of 10 and the sample mean is 40. What is the value of Lower Confidence Limit at 95% CI.

Use paired t-interval procedure to determine a 90% confidence interval for the difference between the mean of x and mean of y. (X, Y) = (49.3, 49), (43.2, 42), (50.4, 50), (36.3, 37), (52.3, 50)

Scores of an IQ test have a​ bell-shaped distribution with a mean of 100 and a standard deviation of 16. Use the empirical rule to determine the following. ​(a) What percentage of people has an IQ score between 68 and 132​? ​(b) What percentage of people has an IQ score less than 84 or greater than 116​? ​(c) What percentage of people has an IQ score greater than 148​? also the 2 other questions thanks so for advances

How can I find the 95% confidence interval for a hazard ratio based on theta1 and theta2 from an exponential distribution? Please can you give an example?

(Please do not give solution in image format thanku)

Confidence interval

A random sample of 12 airline pilot had an average yearly income of 135000 with a standard deviation of 8000 if we want to determine a 99% confidence interval for the average yearly income what is the value of t? develop a 99% confidence interval for the average yearly income of all pilots