Question

Eleven adult black bears were used to predict the weight from the age of adult black bears. Age was measured in years and weight was measured in pounds.

Here is the data:

age 11 7 11 7 8 7 6 8 12 10 6

weight 119 88 112 121 123 136 92 88 130 112 110

The sample size for this analysis is___?____pounds/year.

The slope of the best-fit regression line is___?___, when rounded to two digits after the decimal point.

The 95% confidence interval for the slope to predict the weight from the age of all adult bears is (__?___,___?___). Round these confidence limits to two places.

Answer 1

i) The sample size for this analysis is = 11

The least square regression equation is

The estimated value of slope

and standard error of slope

and sample size n = 11

ii) The slope of the best-fit regression line is = 2.75

iii) a  95% confidence interval for the slope to predict the weight from the age of all adult bears is