The file bodytemp contains normal body temperature readings (degrees Fahrenheit) and heart rates (beats per minute) of 65 males (coded by 1) and 65 females (coded by 2) from Shoemaker (1996).
a. For both males and females, make scatterplots of heart rate versus body temperature. Comment on the relationship or lack thereof.
b. Does the relationship for males appear to be the same as that for females? Examine this question graphically, by making a scatterplot showing both females and males and identifying females and males by different plotting symbols.
c. For the males, fit a linear regression to predict heart rate from temperature. Plot the residuals versus temperature and comment on whether the relationship is linear. Find the estimated slope and its standard error.
d. Repeat the above for females.
e. Test whether the slopes for males and females are equal. (Hint: Consider the difference of the slopes.)
f. Test whether the intercepts are equal.
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