Find the 99% confidence interval of the mean length.

A random sample of 10 children found that their average growth for the first year was 9.8 inches, with a standard deviation of 0.96 inches. Find the 85% confidence interval of the mean growth of all American children in the first year of life.What is the name of the confidence interval?

Report a 95% confidence interval for the slope coefficient. What is the left limit of the interval? Round to four decimals.

You want to get a 90% confidence interval for the difference between the percentage of females with red hair compared to males with red hair. You sample 76 females and find 34 of them have red hair. You sample 65 males and find 33 have red hair. < p1−p2 <

Find the critical value for the population mean if there are 135 cats in a sample and you want an 87% confidence

A sample of 100 postal employees found that the mean time these employees had worked for the postal service was eight years. Assume we know the standard deviation of the population of times postal service employees have spent with the postal service is five years. Find the 98% confidence interval for the mean time the population of postal service employees have spent with the postal service.

Apply the t-interval procedure to find a 95% confidence interval for the mean arterial blood pressure of 8 children sampled if x=85.99 mm Hg and s=8.08 mm Hg

Determine the margin of error in estimating the population mean, μ. Based on a sample of size 44, a 95% confidence interval for the mean score of all students, μ, on an aptitude test is from 67 to 72. Find the margin of error.

Find z* for a confidence level of 83%. Give your answer to 3 decimal places.