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Newsweek magazine (September 19, 1983) reported results of a poll to investigate whether there was a difference between the percentage of women and the percentage of men who approved of the way Ronald.
Reagan was handling his job as president. Of 511 women interviewed, 40% indicated approval. Of 507 men, 49% indicated approval.
a. Find a 90% confidence interval for the difference between the proportion of men and the proportion of women who approved of Reagan's performance. What assumption do you make to use this method?
b. Interpret the interval obtained in part (a). Can you conclude that there is a gender gap?
We are interested in comparing the proportions of males and females who think earning a large salary is very important to them. I surveyed 200 of each gender and recorded their answers to the question as yes or no.
Why is it misleading to draw the conclusion from the test above that long-time exposure to cadmium reduces the vital capacity?
A committee of three is selected at random from a set consisting of five Democrats, eight Republicans, and two Independents.
An advantage of the permutation test over the t test for a difference in means is that - distribution interval or a bootstrap percentile interval
The correct set of hypotheses to test the effect of the bonus plan, the difference between the t and z distributions
A certain random experiment can result in one of four different possible outcomes, which we'll call A, B, C and D.
Assume the researcher's rats can be considered an SRS from the population of all laboratory rats. The mean Math SAT score of these students is found to be 560, 80 points higher than the national average.
The weight of the first orange minus the weight of the second orange) is a random variable with standard deviation and individual outcomes are uncertain but happen in a predictable manner through time.
Write the regression equation approximately. Computed the coefficient of determination(r 2 ).
Find the probability that at least one subject experiences headaches. Is it unusual to have at least one of six subjects experience headaches?
What is the equation for this regression model?
A pediatrician is interested in studying the effect of Motrin on reducing temperature in young children. Four children with influenza have their temperatures taken immediately before and then 20 minutes after taking a standard dose
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