Consider the following regression based on hypothetical data. Now we hypothesize

Question

Consider the following regression based on hypothetical data. Now we hypothesize that only age and height affect people’s weight. So we run a regression analysis of data from a random sample of 25 people, with weight (in pounds) as the dependent variable and age (x variable 1, in years) and height (x variable 2, in inches) as the independent variables. Here is the normal probability plot for weight (y variable):

From the normal probability plot we can conclude that _______

a) the y variable "weight" is reasonably normally distributed because the normal probability plot line is fairly straight

b) the y variable "weight" is not normally distributed because the normal probability plot line is fairly straight

c) the y variable "weight" is reasonably normally distributed because the normal probability plot line is positively sloped, regardless of whether it is straight or not.

d) the y variable "weight" is not normally distributed because the normal probability plot does not show a bell-curve shape

Explanation / Answer

From the normal probability plot we can conclude that _______

a) the y variable "weight" is reasonably normally distributed because the normal probability plot line is fairly straight

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