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Use the following to answer the questions below:

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, and a scatterplot of the data (with regression line) are provided. Assume that students in this class are typical of all students at the university.

Use three decimal places when reporting the results from any calculations, unless otherwise specified.

FacebookFriends677.9307.2 185.01500.0
The regression equation is GPA = 3.830 - 0.000919 FacebookFriends


A scatterplot with a regression line shows the relationship between number of Facebook friends and G P A. The horizontal axis is labeled, Number of Facebook friends and ranges from 0 to 1600 in increments of 200. The vertical axis is labeled, G P A and has markings from 2.50 to 4.00 in increments of 0.25. A regression line starts from (200, 3.675), decreases toward the right, and ends at (1500, 2.45). The dots are randomly scattered, such that a few dots lie above the regression line, a few dots lie below the regression line, and a few dots lie on the regression line. The dots are plotted between the points, 200 to 1500 on the horizontal axis and between the points, 2.10 to 3.95 on the vertical axis. The concentration of the dots is more between the points 300 and 1100 on the horizontal axis and between the points, 2.75 and 3.75 on the vertical axis. An outlier lie at the point, (1500, 2.30). All values are approximate.

Use the provided output to construct a 90% confidence interval for the mean GPA of all students with 800 Facebook friends.

▸ 2.993 to 3.197

▸ 3.035 to 3.155

▸ 2.916 to 3.274

▸ 2.760 to 3.430
Statistics: Unlocking the Power of Data

Statistics: Unlocking the Power of Data

Edition: 3rd
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nancy2457 Author

2 weeks ago
Just got PERFECT on my quiz

Good timing, thanks!

2 hours ago
You make an excellent tutor!
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