Concept explainers
(a)
To explain:The predict mean amount of natural gas Joan will use per day in a month with a mean temperature of 30F.
(a)
Answer to Problem 38E
The predict mean amount of natural gas Joan will use per day in a month with a mean temperature of 30F, is 828.90.
Explanation of Solution
Given:
x: mean temperature in a particular month.
y: mean amount of natural gas used per day in that month.
The given OLS regression line is:
Calculation:
The predict mean amount of natural gas Joan will use per day in a month with a mean temperature of 30F, can be calculated as:
(b)
To explain:The predict mean amount of natural gas Joan will use per day in a month with a mean temperature of 65F.
(b)
Answer to Problem 38E
The predict mean amount of natural gas Joan will use per day in a month with a mean temperature of 65F, is 133.45.
Explanation of Solution
Given:
x: mean temperature in a particular month.
y: mean amount of natural gas used per day in that month.
The given OLS regression line is:
Calculation:
The predict mean amount of natural gas Joan will use per day in a month with a mean temperature of 30F, can be calculated as:
(c)
To explain:Are we confident that each of these predictions are true.
(c)
Explanation of Solution
Given:
As per the given above parts,
Interpretation:
To do prediction by using regression line, that is just a mathematic calculation which may not be true.
Hence, the above predicted value may be true or not be correct or true. Therefore, there is no surety that the prediction is correct.
Chapter 3 Solutions
PRACTICE OF STATISTICS F/AP EXAM
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