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Two sample confidence intervals
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Statistical investigation

These questions again 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.”

a.       Use the data given to create a 95% confidence interval for the difference between the average number of people living together on-campus, and the average number of people living together off-campus.

Let on campus be sample 1 and off campus be sample 2

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

c.       Use the data given to create a 95% confidence interval for the difference between the proportion of on-campus students that own cars, and the proportion of off-campus students that owns cars.

Let on campus be sample 1 and off campus be sample 2

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

Everyday statistics

Please answer the following questions based on the article “Certain Cognitive Behavior Therapy Appears Beneficial for Female Veterans with Post Traumatic Stress Disorder” (the article follows the questions).

1.      Create a 95% confidence interval for the difference between the two treatment groups (prolonged exposure and present-centered therapy) in the proportion of women who no longer meet the criteria for diagnosis of PTSD.  Fully interpret the interval.  Does the confidence interval show evidence of a difference between the two treatments?

Let prolonged exposure be sample 1 and present-centered therapy be sample 2

2.      Create a 95% confidence interval for the difference between the two treatment groups in the proportion of women who achieved total remission.  Fully interpret the interval.

3.      According to this evidence, which treatment is more effective?

4.      Based on the evidence, would you recommend that one of these treatments be adopted as the standard treatment for all female veterans suffering from PTSD?

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Two sample confidence intervals
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