[Ezra Halleck]

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.

[Corey]

How would go about solving this problem?

[Sunny3oy]

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.

[Ezra Halleck]

Excel file for problems 7,8, extra 1 and extra 2 are in the openlab “exam” page (where the final exam word file is).

[Nikoy O’Gilvie]

hey prof need help with interpreting what is being ask and how to start the solutions.

[igorekk132]

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(

[Afzal]

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.

[igorekk132]

Could be, i got pretty confused while doing this prob. Left pretty confident in the beginning though lol o.O

[igorekk132]

Felt*

[mmoej290]

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.