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- FinalReview 8
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8. The FDA has decided to measure 8-ounce cans of Hershey Cocoa. The weights of 50 containers are found in the accompanying excel file. H0: μ≥8
(a) Use a pvalue approach to the t-test at the α = 5% significance level.
(b) Make a histogram to verify that the weights are approximately normally distributed.
How would go about solving this problem?
I think half of these problems can only be done on excel, which I think the professor forgot to attach the excel file onto each topics/questions.
Excel file for problems 7,8, extra 1 and extra 2 are in the openlab “exam” page (where the final exam word file is).
hey prof need help with interpreting what is being ask and how to start the solutions.
Igor Myshcenko ok lets try it: #8 a)
HNull > 8 1 tailed
Sample SD = 0.04
Average mean ( Xbar) = 7.99
n=50
Alpha = 5%
procedure:
SD(XBar)= 0.04/(sqrt(50)=0.00565
TS=(7.99-8.0)/0.00565=-1.77 <- take absolute value
=TDIST(1.77,(50-1),1) = 0.041
finally find the critical region for 1 tailed =SD(Xbar)*TINV(2*p,dof)+Hnull)
=0.00565*TINV(2*0.041,49)+8 equals to 8.01 WE should obtain the critical region for 1 tail. not really sure what to do next(
i think you made a little mistake like i did in no-6 which is “HNull > 8 ” because i think we have to write like H1: μ > 8.
Could be, i got pretty confused while doing this prob. Left pretty confident in the beginning though lol o.O
Felt*
hey, not to sound rude but ann someone rephrase what igorekk132 wrote as the answer, or even he can rephrase it. also it would be cool if u want to attach an exal or pdf file instead of using the post, what ever is easier.
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