Effect size is a value that approximates the sample size and is a component of many statistical tests.

Compute the missing value.
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a.80 homes were sold in April, but only 68 homes were sold in May. The rate of decrease was ______.
b.Start with $120; increase by 50%; end up with ______
c.An increase by $7.50 is 12% of the base value ______.

A television set which cost a dealer $375 was marked up 140%. This item was then marked down 40% for quick sale. What was the sale price?

A) $900.00
B) $210.00
C) $360.00
D) $525.00
E) $540.00

A forester would like to know how big a maple tree might be at age 50 years.She gathers data from some trees that have been cut down,and plots the diameters (in inches)of the trees against their ages (in years).First she makes a linear model.The scatterplot and residuals plot are shown.Do you think the linear model is appropriate? Explain.

The coefficient of determination measures the amount of:

A) variation in y that is explained by variation in x
B) variation in x that is explained by variation in y
C) variation in y that is unexplained by variation in x
D) variation in x that is unexplained by variation in y
E) all of these