Question

Solve question 4....

4) (10 Marks) Two independent experiments are being run in which two different types of paints are compared. Eighteen specimens are painted using type A and the drying time, in hours, is recorded on each. The same is done with type B. a) Suppose that the population standard deviations are both known to be 1.0. Assuming that the mear drying time is equal for the two types of paint, find P(RA-XB>1.0), where XA and XB are average drying times for samples of size nA B 18. b) Repeat Part (a) when the population standard deviations are unknown, but they are still equal and estimated to be 0.96

Answer 1

0 The foRed tion Stande)l deviatons ae boti times fi Sampleg 2 つ2.2 乙> 乙> -t 乙> 0.6550-55s 乙> 0- 33a

乙>3 if /243) By uSig st namal toble) XA-XB 0.003
Note:Due to little confussion about b bit so i couldn't solved.If you want to answer for b bit please post it separately.

Thank you.