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Teaching Sociology (July 1995) developed a model for i the professional socialization of graduate students working toward their doctorate. One of the dependent variables modeled was professional confidence. y, measured on a 5-point scale. The model included over 20 independent variables and was fitted to data collected for a 1 sample of 309 graduate students. One concern is whet he^ multicollinearity exists in the data. A matrix of Pearson product moment correlations for ten of the independent variables is shown on page 622. [Note: Each entry in the table is the correlation coefficient r between the variable in the corresponding row and corresponding column.]
a. Examine the correlation matrix and find the independent variables that are moderately or highly correlated.
b. What modeling problems may occur if the variables, part a, are left in the model? Explain
A wildlife biologist captures a certain species of geese in orer to weigh them. Using science, he determines that the weights are normally distributed with a mean of nine pounds and a standard deviation of 1.3 pounds.
Let N be number of heads obtained on the ten flips. Determine: If you win $1 each time a head appears and you lose $1 each time a tail appears, is this fair game? Describe.
Interpret the correlation between each set of variables.
If the value of the standard normal random variable Z is positive, then the original score is where in relationship to the mean?
Some studies suggest a beta-carotene intake over 3000 mcg may protect against ?macular degeneration. What percentage of people has a dietary beta-carotene intake of at least ?3000 mcg?
Composite sampling is a way to reduce laboratory testing costs. A public health department is testing for possible fecal contamination in public swimming pools
As part of this trial, they wish to determine whether there is a difference between the effectiveness for women and for men. At = .05, what is the test value?
The margin of error for polling results is typically determined as the half-width of a 95% confidence interval. With respect to a particular ballot proposition
how is a discrete variable different from a continuous variable? give one example of each and describe how these
q1. the mcdougal sandwich shop has two windows available for serving customers who arrive at a poisson rate of 40hr.
a study of mba graduates revealed that they have several expectations of prospective employers beyond their base pay.
the data in the following table represent the total rates of return for three stock exchanges over the three-year
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