a) Age, numerical b) Age, categorical c) Weight, numerical d) Weight, categorica

Question

a) Age, numerical

b) Age, categorical    

c) Weight, numerical

d) Weight, categorical

(b) What is the response variable, and what type of variable is it?

a) Age, numerical

b) Age, categorical    

c) Weight, numerical

d) Weight, categorical

(c) Calculate the following (use whole numbers):

k =  
N =  
df1 =  
df2 =

We typically associate body changes with either youth or old age, when these changes are most obvious. But what happens to the body over the course of active adulthood? The National Health and Nutrition Examination Survey takes representative samples of Americans and records various statistics such as gender, age, and weight. Here are data about the weight (in pounds) of men by age range for the 2002 survey (SEM is the standard error of the mean) Decade NSEM 20s 712 183.4 1.5 30s 704 189.1 2.0 40s 776 196.0 16 50s 598 1954 21 704 189 2.0 776 196.0 1.6 598 195.4 2.1

Explanation / Answer

(a) What is the explanatory variable, and what type of variable is it?

a) Age, numerical

(b)

c) Weight, numerical

(c)

There are four decade so k=4

Total number of observations are N = 712+ 704 + 776 + 598 = 2790

df1 = k -1 = 4- 1 =3

df2 = N - K = 2790 -4 = 2786

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