Question
The following data are the monthly salaries y and the grade point averages x for students who obtained a bachelor's degree in business administration. GPA
The following data are the monthly salaries y and the grade point averages x for students who obtained a bachelor's degree in business administration.
GPA | Monthly Salary ($) |
---|---|
2.6 | 3,700 |
3.4 | 3,900 |
3.6 | 4,200 |
3.2 | 3,800 |
3.5 | 4,100 |
2.9 | 3,900 |
The estimated regression equation for these data is
= 2,636.04 + 405.41x
and MSE = 12,927.93.(a)Develop a point estimate of the starting salary (in dollars) for a student with a GPA of 2.7. (Round your answer to the nearest cent).$ (b)Develop a 95% confidence interval for the mean starting salary (in dollars) for all students with a 2.7 GPA. (Round your answers to the nearest cent).$ to $ (c)Develop a 95% prediction interval (in dollars) for Ryan Dailey, a student with a GPA of 2.7. (Round your answers to the nearest cent).$ to $ (d)Discuss the differences in your answers to parts (b) and (c).The confidence interval is wider than the prediction interval, because you use a different critical value when developing a prediction of the starting salary for one new student with a GPA of 2.7 than when developing an estimate of the mean for all students with a GPA of 2.7.The prediction interval is wider than the confidence interval, because you use a different critical value when developing a prediction of the starting salary for one new student with a GPA of 2.7 than when developing an estimate of the mean for all students with a GPA of 2.7. The prediction interval is wider than the confidence interval, because there is more variability associated with predicting the starting salary for one new student with a GPA of 2.7 than there is with estimating the mean for all students with a GPA of 2.7. The confidence interval is wider than the prediction interval, because there is less variability associated with predicting the starting salary for one new student with a GPA of 2.7 than there is with estimating the mean for all students with a GPA of 2.7.The confidence interval is wider than the prediction interval, because confidence intervals are used to predict values of y for new observations corresponding to given values of x, and prediction intervals give an estimate of the mean value of y for a given value of x.
Step by Step Solution
There are 3 Steps involved in it
Step: 1
Get Instant Access to Expert-Tailored Solutions
See step-by-step solutions with expert insights and AI powered tools for academic success
Step: 2
Step: 3
Ace Your Homework with AI
Get the answers you need in no time with our AI-driven, step-by-step assistance
Get Started