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Author Question: As part of a study at a large university, data were collected on n = 224 freshmen computer science ... (Read 103 times)

RRMR

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on: Feb 14, 2020

Question 1

True or False.

The value of R2 is only useful when the number of data points is substantially larger than the number of  β parameters in the model.
◦ True
◦ False

Question 2

As part of a study at a large university, data were collected on n = 224 freshmen computer science (CS) majors in a particular year. The researchers were interested in modeling y, a student's grade point average (GPA) after three semesters, as a function of the following independent variables (recorded at the time the students enrolled in the university):

      x1 = average high school grade in mathematics (HSM)
      x2 = average high school grade in science (HSS)
      x3 = average high school grade in English (HSE)
      x4 = SAT mathematics score (SATM)
      x5 = SAT verbal score (SATV)

A first-order model was fit to data with R2 = 0.211.

What is the correct interpretation of R2, the coefficient of determination for the model?
◦ We expect to predict GPA to within approximately .21 of its true value.
◦ Approximately 79% of the sample variation in GPAs can be explained by the first-order model.
◦ We are 79% confident that the model is useful for predicting y.
◦ Approximately 21% of the sample variation in GPAs can be explained by the first-order model.
Statistics ¦ McClave, Sincich, Tamarack ¦ 12th Edition
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Marked as best answer by RRMR on Feb 14, 2020

brbarasa

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Reply #1 on: Feb 14, 2020
Lorsum iprem. Lorsus sur ipci. Lorsem sur iprem. Lorsum sur ipdi, lorsem sur ipci. Lorsum sur iprium, valum sur ipci et, vala sur ipci. Lorsem sur ipci, lorsa sur iprem. Valus sur ipdi. Lorsus sur iprium nunc, valem sur iprium. Valem sur ipdi. Lorsa sur iprium. Lorsum sur iprium. Valem sur ipdi. Vala sur ipdi nunc, valem sur ipdi, valum sur ipdi, lorsem sur ipdi, vala sur ipdi. Valem sur iprem nunc, lorsa sur iprium. Valum sur ipdi et, lorsus sur ipci. Valem sur iprem. Valem sur ipci. Lorsa sur iprium. Lorsem sur ipci, valus sur iprem. Lorsem sur iprem nunc, valus sur iprium.
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RRMR

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Reply 2 on: Feb 14, 2020
:D TYSM

amandanbreshears

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Reply 3 on: Yesterday
YES! Correct, THANKS for helping me on my review

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