Tattersall et al. (2004) examined body temperature in the South American rattlesnake Crotalus durissus. For each snake, they measured the mass of the meal (in grams) and the change in body temperature (in °C). The following data were obtained (and yes, the first three meal mass values are zero…none of these snakes ate!):
|
Meal Mass |
Temp Change |
|
0.0 |
0.3 |
|
0.0 |
0.2 |
|
0.0 |
0.1 |
|
12.0 |
0.6 |
|
14.5 |
0.6 |
|
23.3 |
0.9 |
|
27.1 |
1.0 |
|
29.3 |
1.0 |
|
20.8 |
1.1 |
|
22.2 |
1.2 |
|
23.4 |
1.2 |
|
36.3 |
1.2 |
|
34.7 |
1.3 |
|
31.6 |
1.3 |
|
29.4 |
1.3 |
|
30.9 |
1.4 |
|
50.4 |
1.3 |
A. Calculate the correlation coefficient for these data.
B. Determine whether the correlation coefficient is significantly different than zero. Be sure to interpret your results and explain your reasons for declaring them significant or not significant.
C. Calculate the regression equation for this relationship, and determine whether the regression slope is significantly different from zero.
