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* Individual Assignment: E-Text

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August 07, 2010

* Chapter Exercises 15.18

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Sixty-four students in an introductory college economics class were asked how many credits they

had earned in college, and how certain they were about their choice of major. Research question:

* At α = .01, is the degree of certainty independent of credits earned?

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Credits Earned Very Uncertain Somewhat Certain Very Certain Row Total

0–9 12 8 3 23

10-59 8 4 10 22

60 or more 1 7 11 19

Col Total 21 19 24 64

Chi= 14.76 p-value= .0052 degree of freedom=4 chi squared at .01 =13.28

H0: There is no difference between credits earned and certainty

H1: There is a difference between credits earned and certanty

Not independant

Conclusion: Since p-value is greater that alpha = 1%, Fail to reject Ho.

The test provides statistical evidence that degree of certainty and credits earned are independent.

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* Chapter Exercises 15.32

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Prof. Green’s multiple-choice exam had 50 questions with the distribution of correct answers shown below. Research question: At α = .05, can you reject the hypothesis that Green’s exam answers came from a uniform population?

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* A 8

* B 8

* C 9

* D 11

* E 14

* TOTAL 50...