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Wildlife scientists have measured the lengths of the heads and the lengths of complete bodies of several crocodiles of two different species. In a summary of the regression analysis given below, the dependent variable for each species is the length of the body.
Species I
Species II
R-squared
96.8%
97.3%
Intercept
-68.3793 cm
-21.2246 cm
Head length coefficient
7.40004
7.71626
Do the following.
Do the association between the sizes of the heads and bodies of the two species appear to be strong? Explain. Hint: Use the values of the correlation coefficient and its meaning in your explanation.
Write the equation of the regression line for each of the species.
The crocodile skeleton found had a head length of 62 cm and a body length of 380 cm. Which species do you think it was? Explain why.
Draw a normal probability plot for residuals using excel or Minitab. Do the residuals seem normally distributed? If yes, why?
No, there is not enough information to refuse hypothesis that proportion of male students who live on campus and proportion of female students who live on campus are same as the test value -1.65 is inside acceptance region (-1.96,1.96).
In order to estimate the difference between the average hourly wages of employees of two branches of a department store, the following data have been gathered.
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