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EXAM REVIEW #4 EXERCISES with answers Corrected COVAR

# EXAM REVIEW #4 EXERCISES with answers Corrected COVAR -...

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Questions 1-17: A researcher wants to know about the relationship between hours middle school students spend playing video games per week and days out sick from school per year. Specifically she wants to know if more video game watching leads to more sick days. The following is a hypothetical set of data for those two variables. Answer the following questions based on the given data. Student Hours of Video per Week Number of days absent due to sickness per year 1 5 6 2 14 7 3 2 1 4 10 5 5 6 5 6 4 3 7 8 4 8 3 1 1. Which is the X variable and which is the Y variable? X is the independent variable Hours of video per week. Y is the dependent variable Number of days absent. 2. Calculate the mean of X 6.50 3. Calculate the mean of Y 4.00 4. Calculate the Variance of X 16 5. Calculate the Variance of Y 4.86 6. Calculate the Standard Deviation of X 4 7. Calculate the Standard Deviation of Y 2.20

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8. Calculate the Covariance of X,Y 7 9. Using the above information calculate b (the slope).
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