these are all statistics questions. My keyboard is not equipped to make all the correct symbols.
If n = 15, x = 37,and s = 4, construct a confidence interval at a 90% confidence level. Assume the data came from a normally distributed population. Give your answers to three decimal places.
1.033 x < u < 1.389 xAssume that a sample is used to estimate a population mean u. Find the 98% confidence interval for a sample of size 61 with a mean of 83.4 and a standard deviation of 18.5. Enter your answer as an open-interval (i.e., parentheses) accurate to 3 decimal places. 98% C.I. =
