Q: Jason believes that the sales of coffee at his coffee shop depend upon the we
ID: 1176385 • Letter: Q
Question
Q: Jason believes that the sales of coffee at his coffee shop depend upon the weather. He has taken a sample and the following are statistics for the numbers of cups of coffee sold and the high temperature for the day.
Descriptive Statistics: Cups of Coffee Sold, Temperature
Variable Mean StDev
Cups of Coffee Sold 160.0 116.8
Temperature 75.0 18.71
Pearson correlation of Cups of Coffee Sold and Temperature =r = -0.952
a) Which variable is the response variable?
b) Compute the least squares equation.
c) What percent of variation of cups of coffee sold can be explained by this regression equation?
d) Predict sales of a 90 degree day.
Explanation / Answer
Response (dependent) variable (y) is the cup of coffee sold
for others read this pdf
http://www.stat.ucla.edu/~hqxu/stat11/ch12.pdf
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