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Note: I am using PhSTATS/Excel software. Please show formula or any important information so I can try to follow along. Thank You.
Q: Studies conducted by the manufacturer of Boston and Vermont asphalt shingles have shown product weight to be a major factor in the customer's perception of quality. Moreover, the weight represented is the amount of raw material being used and is therefore very important to the company from a cost standpoint. The last stage of the assembly line packages the shingles before the packages are placed on wooden pallets. Once a pallet is full (a pallet for most brands holds 16 squares of shingles), it is weighed, and the measurement is recorded. The data file pallet.xls contains the weight (in pounds) from a sample of 368 pallets of Boston shingles and 330 pallets of Vermont shingles.
a.) For the Boston shingles, is there evidence that the mean weight is different from 3,150 pounds?
b.) Interpret the meaning of the p-value in (a.).
c.) For the Vermont shingles, is there evidence that the mean weight is different from 3,700 pounds?
d.) Interpret the meaning of the p-value in (c).
e.) What assumption is needed for (a) and (c).
f.) Evaluate this assumption through a graphical approach. Discuss
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  • PALLET.xls Download Attachment

    Boston Vermont
    3202
    3792
    3134
    3652
    3134
    3652
    3226
    3726
    3236
    3728
    3250
    3676
    3266
    3704
    3224
    3656
    3088
    3666
    3132
    3648
    3098
    3708
    3118
    3682
    3094
    3680
    3108
    3670
    3100
    3728
    3084
    3708
    3134
    3678
    3090
    3660...
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