STEP 2: Set the criteria for making a decision. That is, what is your critical value?(1 point)STEP 3: Summarize the data into the appropriate test-statistic.(2 points)STEP 4: Evaluate the null hypothesis(1 point)In a controlled study, more than 70 Dartmouth College students were instructed to use orange-flavored lozenges at the first sign of an incipient cold, sucking on one as often as every two hours. Half the students got zinc lozenges; half the students were given candies that looked and tasted the same, so that none knew who was really taking the zinc.The participants who were given the zinc had a cold for 4.3 days, as against 9.2 days for those who got the look-alike candies31A. What was the dependent variable in this study? (circle one)(1 point)a. type of cold treatmentb. 70 studentsc. number of days cold continuesd. Dartmouth College

31B. What was the independent variable in this study? (circle one)(1 point)

31C. What is the correct analysis for this experiment? (circle one) (1 point)

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Answers: Chapter 141A.H0:ρ = 0H1:ρ ≠ 0rcrit= ± .959r = .56Fail to reject H0There is insufficient evidence to conclude that there is a significant linear relationship.1B.The regression equation is ˆ Y .79X1.57.The answer is 8.68 or 8 answers. 2A.12,9802B.34,9802C.22D.12.982E.2 and 12.983.c4.See text5.-0.97, +0.84, +0.26, -0.056.a7.d8.See text9. variability in Y that is explained by differences in X10A.ˆ Y X810B.2.45The standard deviation of points about the regression line (standard error) is 2.45.11.Yes

Answers: Chapter 151.Categorical or frequency data2.See p. 428 of your text3.See pp. 230-431 of your text4.k stands for k-k-categories (number of groups)5.A6.See text7.D8.B9.H0: The incidence of depression is independent of season.H1: The incidence of depression is not independent of season.χ2crit = 11.35χ2= 22.77Reject H0The incidence of depression is independent of season (they are related).10.H0: observed frequencies are equal to the expected frequenciesH1: observed frequencies are not equal to the expected frequenciesχ2crit = 7.82χ2= 27.2Reject H0Local viewers prefer some evening news programs over others.11.H0: Book-carrying styles are independent of genderH1: Book-carrying styles are not independent of genderχ2crit = 5.99χ2= 51.2Reject H0Men compared with women tend to carry books down at their side rather than in front of them.12.Chi-square test of independence: consider 2 variables at once to determine if they are independent (related).Chi-square goodness of fit test: consider 1 variable at a time. Compares actual data to what we expect by chance.

Final Exam: Sample Test Answers

21) STEP 1: H0: ρ = 0H1: ρ ≠ 0Null: The correlation does not exist in the populationAlternative: The correlation does exist in the populationSTEP 2: df = n - 2 = 28 - 2 = 26rcrit= ±0.374STEP 4: Reject the null.......so, yes there is a relationship