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A large university wanted to study the relationship between completing an internship during college and students' future earning potential. Investigators selected a random sample of 80 students who completed an internship (X=1) and 100 students who did not complete an internship (X=0) and examined their salaries five years after graduation (Y). They found that there was a statistically higher mean salary for the internship group than for the non-internship group. Select all of the following responses that are correct There could be a confounding variable, such as student major, that explains the difference in mean salary between the internship and no internship groups. We cannot infer anything from these data since the distribution of salaries is likely right skewed. O You cannot draw any valid conclusions because the sample sizes are different. O If the fitted regression equation is Y = a + bX, the value of b must be positive

A large university wanted to study the relationship between completing an internship during college and students' future earning potential. Investigators selected a random sample of 80 students who completed an internship (X=1) and 100 students who did not complete an internship (X=0) and examined their salaries five years after graduation (Y). They found that there was a statistically higher mean salary for the internship group than for the non-internship group. Select all of the following responses that are correct There could be a confounding variable, such as student major, that explains the difference in mean salary between the internship and no internship groups. We cannot infer anything from these data since the distribution of salaries is likely right skewed. O You cannot draw any valid conclusions because the sample sizes are different. O If the fitted regression equation is Y = a + bX, the value of b must be positive

A First Course in Probability (10th Edition)
A First Course in Probability (10th Edition)
10th Edition
ISBN:9780134753119
Author:Sheldon Ross
Publisher:Sheldon Ross
Chapter1: Combinatorial Analysis
Section: Chapter Questions
Problem 1.1P: a. How many different 7-place license plates are possible if the first 2 places are for letters and...
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A large university wanted to study the relationship between completing an internship during college and students' future earning potential. Investigators selected a random sample of 80 students who completed an internship (X=1) and 100 students who did not complete an internship (X=0) and examined their salaries five years after graduation (Y). They found that there was a statistically higher mean salary for the internship group than for the non-internship group. Select all of the following responses that are correct There could be a confounding variable, such as student major, that explains the difference in mean salary between the internship and no internship groups. We cannot infer anything from these data since the distribution of salaries is likely right skewed. O You cannot draw any valid conclusions because the sample sizes are different. O If the fitted regression equation is Y = a + bX, the value of b must be positive
Transcribed Image Text:A large university wanted to study the relationship between completing an internship during college and students' future earning potential. Investigators selected a random sample of 80 students who completed an internship (X=1) and 100 students who did not complete an internship (X=0) and examined their salaries five years after graduation (Y). They found that there was a statistically higher mean salary for the internship group than for the non-internship group. Select all of the following responses that are correct There could be a confounding variable, such as student major, that explains the difference in mean salary between the internship and no internship groups. We cannot infer anything from these data since the distribution of salaries is likely right skewed. O You cannot draw any valid conclusions because the sample sizes are different. O If the fitted regression equation is Y = a + bX, the value of b must be positive
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