Question 1
In a study of feeding behavior, zoologists recorded the number of grunts of a warthog feeding by a lake in the 15 minute period following the addition of food. The data showing the number of grunts and the age of the warthog (in days) are listed below:
| b. | Interpret the value of s. |
Question 2
A county real estate appraiser wants to develop a statistical model to predict the appraised value of houses in a section of the county called East Meadow. One of the many variables thought to be an important predictor of appraised value is the number of rooms in the house. Consequently, the appraiser decided to fit the simple linear regression model:
E(y) = β0 + β1x,
where y = appraised value of the house (in thousands of dollars) and
x = number of rooms. Using data collected for a sample of
n = 74 houses in East Meadow, the following results were obtained:
= 74.80 + 19.72
x
Give a practical interpretation of the estimate of
σ, the standard deviation of the random error term in the model.
◦ We expect to predict the appraised value of an East Meadow house to within about $58,000 of its true value.
◦ We expect to predict the appraised value of an East Meadow house to within about $29,000 of its true value.
◦ About 29% of the total variation in the sample of
y-values can be explained by the linear relationship between appraised value and number of rooms.
◦ We expect 95% of the observed appraised values to lie on the least squares line.
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