From a sample of 50 monthly returns of a stock, you have determined a sample mean of 0.36% and standard deviation of 0.2%. Construct a 90% confidence interval for the monthly return and report the standard error to 6 decimal places and include a leading. 0. Question 9 From a sample of 50 monthly returns of a stock, you have determined a sample mean of 0.36% and standard deviation of 0.2%. Construct a 90% confidence interval for the monthly return and report the z-value reliability factor to 5 decimal places. 4

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?

The newest model of a car battery from a popular brand is supposed to have a lifetime of  60  months, but the lifetime varies slightly from battery to battery. It is known that the population of all lifetimes (in months) of this model of car battery is approximately normally distributed. You are a product reviewer who wants to estimate the standard deviation for this population with a random sample of  22  car batteries. Follow the steps below to construct a  99%  confidence interval for the population standard deviation of all lifetimes of this model of car battery. (If necessary, consult a list of formulas.) (a)Click on "Take Sample" to see the results from the random sample. Take Sample Number of carbatteries Sample mean Sample standard deviation Sample variance 22 57.16 0.38 0.1444   To find the confidence interval for the population standard deviation, first find the confidence interval for the population variance. Enter…

The president of a large university wishes to compare the standard deviation of the ages of students presently enrolled to previous years. The distribution of ages has been approximately normal. Find the 90% confidence interval for the population standard deviation of the student ages of the University. A random sample of 20 university students has a standard deviation of 6.1 years in a mean of 23.8 years what is the confidence interval of the population standard deviation?

If n = 550 and X = 440, construct a 90% confidence interval for the population proportion, p. Give your answers to three decimals < p <

The newest model of a car battery from a popular brand is supposed to have a lifetime of  60  months, but the lifetime varies slightly from battery to battery. It is known that the population of all lifetimes (in months) of this model of car battery is approximately normally distributed. You are a product reviewer who wants to estimate the standard deviation for this population with a random sample of  22  car batteries. Follow the steps below to construct a  99%  confidence interval for the population standard deviation of all lifetimes of this model of car battery. (If necessary, consult a list of formulas.) (a)Click on "Take Sample" to see the results from the random sample. Take Sample Number of carbatteries Sample mean Sample standard deviation Sample variance           To find the confidence interval for the population standard deviation, first find the confidence interval for the population variance. Enter the values…