1. In a contingency table analysis, the row and column variables are usually bot
ID: 3241241 • Letter: 1
Question
1. In a contingency table analysis, the row and column variables are usually both measured at which level of measurement?
A.interval
B.ordinal
C. nominal
D. ratio
2.A Trent graduate student is conducting a hypothesis test using a Chi-square distribution (a=0.10), to test if sex (ie male or female) has any influence on preferred recreation activity (5 categories to choose from). The critical value for this test would be
A. 11.07
B.10.645
C.11.143
D.7.779
E.9.236
3.Which of the following contingency tables will have the smallestcritical X2value (a=0.05)?
A.One having 2 rows and 5 columns
B.One having 3 rows and 5 columns
C.One having 5 columns and 3 rows
D.One having 4 columns and 4 rows
E.One having 2 columns and 2 rows
4.It is known that roses always respire exactly 22% of the oxygen taken in as carbon dioxide. The correlation coefficient between the amount of carbon dioxide taken in and amount of oxygen respired for a sample of 20
plants would be:
A. 0.22
B. -0.22
C. 1.0
D. 0.78
5.In linear regression r2 is
A. the coefficient of determination
B. the slope
C. the total variance
D. the intercept.
6.A correlation coefficient (r) of –0.84 indicates
A. a weak inverse relationship.
B. one variable must have negative values.
C. a strong inverse relationship.
D. a strong direct relationship.
7.The slope of the regression line
A. has units of y only
B. is always larger than the intercept
C. can be either negative or positive in sign
D. will always be positive and £1.0.
9.When the points are tightly clustered about the regression line, this means that the correlation is
A. negative.
B. between two measures that are unreliable.
C. heterogeneous.
D. high.
10.In a summer study, if the correlation between air temperature and activity level of seniors was high and negative, it would suggest that:
A. senior activity levels increase with increasing temperatures.
B. senior activity levels decrease with increasing temperatures.
C. senior activity levels decrease with decreasing temperatures.
D. seniors don’t like high temperature
Explanation / Answer
1) option C
2)for (n-1=4) degree of freedom and 0.1 level critical value =7.779
D.7.779
3)
E.One having 2 columns and 2 rows (As it will have lowest degree of freedom)
4)
option C is correct
5)
A. the coefficient of determination
6)
C. a strong inverse relationship.
7)
C. can be either negative or positive in sign
9)
D. high.
10)
B. senior activity levels decrease with increasing temperatures.
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