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Statistical investigation
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These questions use data from a survey of Albers students conducted in Fall 2014, regarding their housing situation.  The data are found in the file “housing survey data fall 2014.”

Row Labels

Average of NUMBER LIVING TOGETHER

StdDev of NUMBER LIVING TOGETHER

Count of NUMBER LIVING TOGETHER

OFF

2.891566265

1.306755881

83

ON

2.607142857

1.165532328

28

a.  Use the data given to create a 95% confidence interval for the average number of people in a household (“number living together” is the name of the variable) for students living on campus.  (note- you might look at Excel question 7, pp. 270-271, for an illustration of how to do this in Excel).

b.  Interpret the confidence interval created in part a.  Exactly what does it tell you?

c.  Use the data to create a 95% confidence interval for the average number of people in a household (“number living together” is the name of the variable)  for students living off campus

d.  Interpret the confidence interval created in part c.  Exactly what does it tell you?

e.  Compare the two confidence intervals.  Is there evidence of a difference between on and off campus students in the average number of roommates?

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