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Police estimate that in one city 48% of drivers wear their seat belts. They set up a safety roadblock, stopping cars to check for seat belt use. If they stop 40 cars during the first hour, what is the mean of the number of drivers expected to be wearing their seat belts?
The standard deviation of the distribution of means of change scores is 2.0 and the mean change score for the sample studied is an increase of 5.2. What is the t score?
Discuss an example from every day life, your professional experience, personal life or sports where two variables are positively correlated and why; discuss a second example where two variables are negatively correlated and why.
More than 5 percentage points in either direction from what would have been got by interviewing all voters in United States." Determine sample size suggested by this statement.
A regression equation was computed to be Y'=35+ 6X. The value of the 35 indicates that
At the .10 significance level you will test to determine if there has been an increase in selling time. What is your decision?
You have just received an inheritance of $10,000 and you decide that you should invest the money rather than blow it on frivolous items.
A sample of n = 25 scores has a mean of M = 40 and a variance of s2 = 100. If this sample is being used to test a null hypothesis stating that m = 43, then what is the tstatistic for the sample?
According to the patient's history and physical examination. What are the chances of herniation if the MRI is positive?
Estimate the minimum sample size necessary to estimate the true mean grams of fat to within plus or minus 2 grams with 98 percent confidence.
An investigator wants to design a study to estimate the difference in the mean BMI between boys and girls age 12 living in new york city. How many boys and girls are needed to ensure 95% confidence interval estimate for the difference in mean BMI ..
Finding the Equation of the Regression Line and Making Predictions. Find the regression equation,
Chi-square test for independent attributes - Are the opinions on the tax cut proposal independent of party affiliation? Use a = 0.01
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