# Project #69271 - stats

NO HIGHLIGHTS PLEASE! see attachment for graphs:

1. The formula for a regression equation is Y’ = 2X + 9.

a. What would be the predicted score for a person scoring 6 on X?

b. If someone’s predicted score was 14, what was this person’s score on X?

2. For the X,Y data below, compute:

a. r and determine if it is significantly different from zero.

b. the slope of the regression line and test if it differs significantly from zero. c. the 95% confidence interval for the slope.

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3. At a school pep rally, a group of sophomore students organized a free raffle for

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prizes. They claim that they put the names of all of the students in the school in

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the basket and that they randomly drew 36 names out of this basket. Of the prize

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winners, 6 were freshmen, 14 were sophomores, 9 were juniors, and 7 were

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seniors. The results do not seem that random to you. You think it is a little fishy tô°hô°ô°ƒaô°tô°žsô°¡oô°¢pô°­hô°oô°¦mô°ƒô°…oô°ƒô° rô°£eô°‘sô°¡oô°£ô°’rô°gô°…aô°¡nô°izô°¥eô°ƒô°¦dô°¥tô° hô°¦ô°ƒeô°¦ô°žrô°ƒaô° fô°¥flô°¥eô°ƒô°£aô°¨ô°ƒnô°¦ô°dô°¥aô°¤lô°¥sô°ƒoô°£ô° wô°ƒô°…oô°ƒô°¤nô°¥ô°“tô°…hô°³eô°žmô°¡ô° oô°sô°£tô°°pô°ƒô°‚riô°¥zô°¦eô°±s.ô°¥Yô°¥ô°¡oô°ƒuô° rô°§sô°žcô°‹hô°£oô°¡oô°‘lô°ƒô°…isô°¡ô°¢ô°ƒô°£ô°¡ô°ô°žô°¡ô°³ô°´ coô°¡mô°¥pô°¡oô°sô°¥eô°dô°ƒô°€oô°f ô°…3ô°¦0ô°ƒô°%ô°ô°£fô°ƒô°„reô°¬sô°­hô°…mô°¤ô°¥eô°ƒnô°©,ô°…2ô°“ô°­5ô°¥%ô°ƒô°¢ô°žsoô°ƒô°Ÿpô°žhô°­oô°ƒmô°‘ô°¥oô°¦rô°ªeô°ƒô°€s, ô°2ô°…5ô°¦%ô°ƒô°°ô°ƒjô°©uô°…nô°“iô°­oô°¥rô°ƒsô°¢, ô°žaô°ƒnô°Ÿdô°žô°­2ô°ƒ0ô°‘%ô°¥ô°¦ô°ªsô°ƒeniors.

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a. What are the expected frequencies of winners from each class?

b. Conduct a significance test to determine whether the winners of the prizes

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were distributed throughout the classes as would be expected based on the

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percentage of students in each group. Report your Chi Square and p values.

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4.

A geologist collects hand-specimen sized pieces of limestone from a particular

area. A qualitative assessment of both texture and color is made with the

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following results. Is there evidence of association between color and texture for

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 Subject Mathematics Due By (Pacific Time) 05/03/2015 01:00 pm
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