Cramming stats 😍

If you had a sample of 100 and were estimating the mean, then the mean estimate would be N(mu, sigma^2/100). Youre not estimating the mean here.

Hi! I am also stuck on this hypothesis test. So far:
I have established it's a 2 tailed test so halve the S.L. I used normal PD, and typed in X as 34.5, mu as 32.5 and sigma as 8.2^2/50. I got a different answer to the mark scheme (I got 0.09816744 before halving). Mark scheme says 0.0423. please could someone help me?

Not got a fancy calculator, so can't help with actual input, but 8.2^2/50 is the variance, $\sigma^2$: You need the square root of that.

Hi! thank you. i tried it but got 0.0777488 before halving. im not sure how to get 0.0423 :/

I did it via tables and got 0.0423, so it's something to do with how you're using the calculator - mistype?

Mean is 32.5, s.d. is $8.2/\sqrt{50}$, and observation is 34.5

thank you!! i have the fx 991ex and i used normal pd. did you do the same?

No, I did it manually via tables. Can't help with the calculator side of things.