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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 161 times)

anjilletteb

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on: Feb 14, 2020

Question 1

Retail price data for n = 60 hard disk drives were recently reported in a computer magazine. Three variables were recorded for each hard disk drive:

y   = Retail PRICE (measured in dollars)
x1 = Microprocessor SPEED (measured in megahertz)
               (Values in sample range from 10 to 40)
x2 = CHIP size (measured in computer processing units)
               (Values in sample range from 286 to 486)

A first-order regression model. was fit to the data. Part of the printout follows:

Parameter Estimates


Identify and interpret the estimate of β2.

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.

A 95% confidence interval for β1 is (.06, .22). Interpret this result.
◦ We are 95% confident that a CS freshman's GPA increases by an amount between .06 and .22 for every 1-point increase in average HS math grade, holding x2 - x5 constant.
◦ We are 95% confident that the mean GPA of all CS freshmen after three semesters falls between .06 and .22.
◦ 95% of the GPAs fall within .06 to .22 of their true values.
◦ We are 95% confident that a CS freshman's HS math grade increases by an amount between .06 and .22 for every 1-point increase in GPA, holding x2 - x5 constant.
Statistics ¦ McClave, Sincich, Tamarack ¦ 12th Edition
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Marked as best answer by anjilletteb on Feb 14, 2020

samiel-sayed

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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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anjilletteb

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Reply 2 on: Feb 14, 2020
YES! Correct, THANKS for helping me on my review

apple

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Reply 3 on: Yesterday
:D TYSM

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