Gross 1985 in a study of eating disorders in adolescents ask

Gross (1985), in a study of eating disorders in adolescents, asked each of her subjects whether they would prefer to gain weight, lose weight, or maintain their present weight. When she broke down the data for grits by race (black vs. white) she obtained the following results: (Use 2 decimal places please) fe = fcfr / n. What is the expected value for white adolescents who would prefer to gain weight? What is the expected value for white adolescents who would prefer to lose weight? What is the expected value for white adolescents who would prefer to maintain weight? What is the expected value for black adolescents who would prefer to gain weight? What is the expected value for black adolescents who would prefer to lose weight? What is the expected value for black adolescents who would prefer to maintain weight? Determine critical value with a = .05 and df=(r- 1) (c -1): Determine Chi-Square: x^2 = sigma (f0 - fe) ^2 / fe Zr Decision (do you reject or fail to reject H0): Interpretation: Darley and Latane (1968) asked participate to volunteer in a discussion carried on over an intercom. Aside from the experimenter to whom they were speaking, subjects thought that there were zero, one, or four other people (bystanders) also listening over intercoms. Partway through the discussion, the experimenter feigned serious illness and asked for help. Darley and Latane noted whether or not the subject sought help for the experimenter as a function of the number of supposed bystanders. What test statistic should they use to analyze this data set? Two-way ANOVA One-way ANOVA Chi-square test of independence

Solution

Q1.

8.588

ChiSquare Table:

[ANSWERS]

a)
336.6956
b)
151.8927
c)
46.412
d)
62.3044
e)
28.1073
f)
8.588
g) 7.81 f) 37.231 i) Reject Ho

	Gain-We	Lose-We	Main-We
White	352	152	31	535	A1
Black	47	28	24	99	A2
Totals	399	180	55	634