[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.