Data were collected on gpa and number of facebook friends, Ask an Expert

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Data were collected on GPA and number of Facebook friends for students in a small statistics class. Some summary statistics, partial output from the regression analysis are provided. Assume that the students in this class are typical of all students at a university.

Variable	Mean	St Dev	Minimum	Maximum
GPA	3.2067	0.4118	2.4000	3.9500
Facebook Friends	677.9	307.2	185.0	1500.0

The regression equation is GPA = 3.830 - 0.000919 Facebook Friends

Source	DF	SS	MS	F	P
Regression	1	2.31193	2.31193	24.85	0.000
Error	28	2.60534	0.09305
Total	29	4.91727

a) Determine whether we should have any strong concerns about the conditions being met for using a linear model with these data. Explain.

b) Write down the equation of the least squares line and use it to predict the GPA for someone with 800 Facebook friends.

c) The correlation between GPA and number of Facebook friends is -0.686. Use the correlation and signficance level of 5% to test for a negative linear association between GPA and number of Facebook friends. Include all details of the test.

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Statistics and Probability, Statistics

Category:- Statistics and Probability
Reference No.:- M9998600

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