A group of 50 individuals has been surveyed on the number of hours devoted each day to sleeping and watching TV. The responses are summarized in the following table:
|No. of sleeping hours (x)||6||7||8||9||10|
|No. of hours of television (y)||4||3||3||2||1|
|Absolute frequencies (fi)||3||16||20||10||1|
1 Calculate the correlation coefficient.
2 Determine the equation of the regression line of y on x.
3 If a person sleeps eight hours, how many hours of TV are they expected to watch?
|xi||yi||fi||xi · fi||xi2 · fi||yi · fi||yi2 · fi||xi · yi · fi|
There is a strong negative correlation.