Unit Test — Unit test Answers
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Make a scatter plot of the data below. x y 25 150 50 178 75 216 100 265 125 323 150 392 175 470.4 Using the quadratic regression equation predict what the y-value will be if the x-value is 200.
A
y = 83.5B
y = 346.9C
y = 238.1D
y = 555.5
23
The number of VHS movie rentals has declined since the year 2000 due to the popularity of DVDs, as the following table shows. Use a graphing calculator to determine the exponential regression equation that best fits the VHS rental data. Let x represent the number of years since 2000. Year 2000 2001 2002 2003 2004 2005 2006 VHS Rentals (in millions) 10.5 7.8 6.3 5.1 4.4 3.6 3.1
A
y = 9.75(0.08197)xB
y = 10.50(0.08217)xC
y = 9.87(0.8213)xD
y = 10.50(0.80662)x24
What is the relation between the variables in the equation ?
A
y varies directly as xB
y varies inversely as xC
y varies jointly as xD
none of the above
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