
Concept explainers
a.
To find: An equation of the regression line.
a.

Answer to Problem 8PPS
The equation of regression line is
Explanation of Solution
Given Information: A table showing the record of the number of campsites rented.
X is the number since 2007
Calculation:
An equation of the best fit line is given by,
- Here, a is the intercept and b is the slope.
The years start from 2009 and go on till 2017.
Assume the year 2007 as 0 and x be the number of years since 2007.
Find
2 | 34 | 68 | 4 |
3 | 45 | 135 | 9 |
4 | 42 | 168 | 16 |
5 | 53 | 265 | 25 |
6 | 58 | 348 | 36 |
7 | 47 | 329 | 49 |
8 | 57 | 456 | 64 |
9 | 65 | 585 | 81 |
10 | 59 | 590 | 100 |
Sum of every column is,
Calculate a as,
Calculate b as,
Substitute the values of a and b in equation (1),
- Here, x be the number of years since 2007.
Hence, the equation of regression line is,
b.
To calculate: The number of campsites that will be rented in 2019.
b.

Answer to Problem 8PPS
The number of campsites that will be rented in 2019 is 69.515.
Explanation of Solution
Given Information: The equation of regression line is
Calculation:
Substitute
The number of campsites that will be rented in 2019 is 69.515.
c.
To calculate: The number of campsites that will be rented in 2027.
c.

Answer to Problem 8PPS
The number of campsites that will be rented in 2027 is 94.051
Explanation of Solution
Given Information: The equation of regression line is
Calculation:
Substitute
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