Inferential Statistics

1. The sum of the expected frequencies must be equal to

		the df
		the sum of the observed frequencies
		none of the choices are correct
		(R - 1)(C - 1)

5 points   

QUESTION 2

1. In a 2 x 3 data set with four frequencies in each cell, a chi square analysis would have ___ df.

		2
		5
		18
		24

5 points   

QUESTION 3

1. Find the Chi-Square critical value for goodness of fit where alpha is the level of significance and k is the number of possible outcomes for each trial.

alpha (level of significance) =0.05 and k = 22, where degree of freedom = k - 1

		29.615
		32.671
		35.479
		41.401

5 points   

QUESTION 4

1. Find the Chi-Square critical value for goodness of fit where alpha is the level of significance and k is the number of possible outcomes for each trial.

alpha (level of significance) =0.01 and k = 9, where degree of freedom = k - 1

		13.362
		17.535
		20.090
		21.955

5 points   

QUESTION 5

1. In a χ2 test of independence between gender and kinds of phobias, the null hypothesis was rejected. The proper conclusion is that

		gender and phobias are related to each other
		knowing a person's phobia gives you no clue to his or her gender
		none of the choices are correct
		gender and phobias are independent of each other

5 points   

QUESTION 6

1. When contrasted with Pearson's correlation calculation, Spearman's correlation coefficient measures how well the data fits what assumption about the data? 

		That the data has a linear trend
		That the data is random
		That the data has an exponential trend
		That the data has a monotonic trend

5 points   

QUESTION 7

1. Suppose a researcher found an rs of .89 between amount of blood cholesterol and the severity of the heart attack. Based on an N of 6 and a two-tailed test, the researcher should conclude

		not significant
		significant at the .05 level
		p > .05
		higher blood cholesterol causes more severe heart attacks

5 points   

QUESTION 8

1. To describe the degree of relationship between two sets of data, use a

		none of the choices are correct
		chi-square test
		ANOVA
		Spearman rs

5 points   

QUESTION 9

1. The general form of a null hypothesis for a Spearman correlation is:

		H0: There is a [monotonic] association between the two variables [in the population].
		H0: There is no [monotonic] association between the two variables [in the population].
		H0: There is an equal association between the two variables [in the population].
		H0: There is not an equal association between the two variables [in the population].

5 points   

QUESTION 10

1. A Spearman rs is most similar to a

		mean
		median
		standard deviation
		product-moment correlation coefficient