Question

The standard deviations s for the annual medical costs 30 heart disease patients was found to equal $1005. Find a 95 % confidence interval for the standard deviation of the annual medical costs for all heart disease patients.
bobpursley
N=30

http://www.milefoot.com/math/stat/ci-variances.htm
One hundred subjects in a psychological study had a mean of 35 on a test instrument designed to measure anger. The study the ó=10. Find a 99% confidence interval for the mean anger score of the population.

95% = mean ± 1.96 SEm

99% = mean ± 2.575 SEm

SEm = SD/√n
what is n

Related Questions

Question An investor puts $15,000 into each of four stocks, labeled A, B, C, and D. The table shown... Cindy is a cardiologist whose patients use wearable technologies to monitor their heart health. What... Medical care can be very costly for consumers and patients and people often need to get creative or...