Asked by Karly

Find the 99% confidence interval for the difference between two means based on this information about two samples. Assume independent samples from normal populations. (Use conservative degrees of freedom.) (Give your answers correct to two decimal places.)

Sample Number Mean Std. Dev.
1 23 38 30
2 11 23 35

Lower Limit:
Upper Limit:
Answered by Kuai


(38-23) -+ 3.169* sqrt((30^2/23 +35^2/11)

Lower limit -23.88

Upper limit 53.88
Answered by Karly
Thanks for your help!
Answered by Ally
How did you find the 3.169, please?
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