Question 140360: Hello, I a sorry to be inquiring help from you but this is a hard subject for me. I have includewhat I believe the answers are but I don't trust my own answers. Please help:
Sherry Weinstein, a buyer, has decided that she will spend an extra $7 per shirt for the next 10,000 T-shirts she buys for her chain of stores only if the vendor of the more expensive shirt can show conclusive evidence that its shirt can withstand at least 20 more times in the wash without fading. The vendor elected to set m1 as the mean number of washes without fading for the more expensive shirt. An appropriate null hypothesis for the vendor to test is
a. H0: m1 – m2£ 20.
b. H0: m1 – m2 < 20
c. H0: m1 – m2 > 20. (I chose c)
d. H0: m1 – m2£ 0
The technique that is used to determine if more than two population means are equal by analyzing the variation in the data is known as
a. chi-square.
b. analysis of variance.
c. correlation analysis. (I chose c)
d. least squares regression.
The least squares method finds the equation of the line that __________ the __________ of the squared deviations between the points and the line.
a. maximizes, sum
b. minimizes, product
c. minimizes, sum
d. maximizes, product (I picked d)
Thanks for your help.
Answer by stanbon(75887)   (Show Source):
You can put this solution on YOUR website! Sherry Weinstein, a buyer, has decided that she will spend an extra $7 per shirt for the next 10,000 T-shirts she buys for her chain of stores only if the vendor of the more expensive shirt can show conclusive evidence that its shirt can withstand at least 20 more times in the wash without fading. The vendor elected to set m1 as the mean number of washes without fading for the more expensive shirt. An appropriate null hypothesis for the vendor to test is
a. H0: m1 – m2£ 20.
b. H0: m1 – m2 < 20
c. H0: m1 – m2 > 20. (I chose c)
d. H0: m1 – m2£ 0
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Ho MUST have equality in it. Your a and d statements have a funny looking
symbol in them so cannot be understood. The inequality implied by the
statement of the problem MUST be shown in the alternate hypothesis, not
in Ho.
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The technique that is used to determine if more than two population means are equal by analyzing the variation in the data is known as
a. chi-square.
b. analysis of variance.
c. correlation analysis. (I chose c)
d. least squares regression.
Ans: ANOVA
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The least squares method finds the equation of the line that __________ the __________ of the squared deviations between the points and the line.
a. maximizes, sum
b. minimizes, product
c. minimizes, sum
d. maximizes, product (I picked d)
Ans: Should be "b"; that is why it is call the LEAST squares method.
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Cheers,
Stan H.
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