Exam 2 Review - Steps to getting actual answers!_1

Exam 2 Review - Steps to getting actual answers!_1 -...

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Unformatted text preview: Question 1 C Grade B A Amount Studied L M H 2 67% 1 25% 0 100% 1 33% 2 50% 1 33% 0 0% 1 25% 2 67% 3 100% 4 100% 3 100% 3 30% 4 40% 3 30% 10 100% Question 2 C Grade B A L 2 1 0 3 Amount Studied M H 1 0 2 1 1 2 4 3 3 4 3 Gamma D 0 x (2+1+1+0) 1 x (1 + 0) 1 x (1 + 0) 2 x (0) total = 22 Question 3 C 2 x (2+1+1+2) 1 x (2+1) 1 x (2+1) 2 x (2) total = 2 GIVEN ==== FREQUENCY Frequency of Time Spent on Facebook Low Freq of dates in past year Low Medium High TOTALS Med High 3 5 1 4 2 4 6 13 TOTALS 4 3 0 6 12 7 6 25 172 78 102 130 59.9 ­34.1 ­10.1 17.9 Question 4 & Question 5 For 4, 5, 6 Hours spent listening to music x 15 7.3 2 ­5.7 4 ­3.7 12 4.3 53.29 32.49 13.69 18.49 IQ y 3588.01 1162.81 102.01 320.41 n=10 12 6 8 3 4 11 77 x = 7.7 ̅ Question 6 b= 4.3 ­1.7 0.3 ­4.7 ­3.7 3.3 186.1 or b = b = 5.72 a = a = 112.1 ­ 5.72 (7.7) a = 68.056 y = a + bx y = 68.056 + 5.72x Question 7 Table 1 18.49 2.89 0.09 22.09 13.69 10.89 124 92 114 84 98 127 1121 y = 112.1 ̅ 11.9 ­20.1 1.9 ­28.1 ­14.1 14.9 141.61 404.01 3.61 789.61 198.81 222.01 6932.9 Table 2 Question 8 x (2+1+1+0) Gamma= (22­2)/22+2 Gamma = .83333 TO GET PERCENTS Frequency of Time Spent on Facebook Low Freq of dates in past year Low Medium High TOTALS Medium High 3/6 5/13 1/6 4/13 2/6 4/13 6/6 13/13 4/6 2/6 0/6 6/6 TOTALS 12/25 7/25 6/25 25/25 Freq of dates in past year Q4 Covariance = 437.27 194.37 37.37 76.97 Covariance = 1065.3 Interpretation: There is a positive relationship between listening to dance music and IQ ­­ meaning the more you listen to dance music, the higher your IQ. TOTALS 51.17 34.17 0.57 132.07 52.17 49.17 There is a positive relationship between listening to dance music and IQ ­­ meaning the more you listen to dance music, the higher your IQ. Q5 Pearson’s R = R = 1065.3 1065.3 R= R= .938 There is a strong positive Interpretation: relationship between the amount of dance music you listen to and your IQ. Without knowing anything else, you can get this information from the table. SS = Squared Sum 0.5 So in the row under that where it says model is the ESS ­ the explained sum of squares. So in the row under that where it says model is the ESS ­ the explained sum of squares. In the row under total ­ its the total error in the model… the SSE. RMS = RMS = RMS = 195.99 0.26 RMS = RMS = 2528.345 0.65 RMS = RMS = 3.4388896 Expected weight! y = 39.44 -0.006x 30 = 39.44 ­ 0.006x 9.44 = .006x 1573.333 = x PERCENTS FOR COMPARISSON Frequency of Time Spent on Facebook Low Medium High Low 50% 38% 67% Medium 17% 31% 33% High 33% 31% 0% TOTALS 100% 100% 100% TOTALS 48% 28% 24% 100% where it says model d sum of squares. s the total error in ...
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This note was uploaded on 09/14/2011 for the course STATISTICS 0825 taught by Professor Dr.arceneaux during the Fall '09 term at Temple.

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