Stats Assignment
Autor: thekennedycurse • November 23, 2015 • Coursework • 340 Words (2 Pages) • 736 Views
Stats Assignment 3
Brandon Humber
November 10, 2015
- a) Car Price mean = 14.1, Age of Car mean = 11.5
Car Price Squared Standard Deviation | Age of Car Squared Standard Deviation | |
6 - 14.1 = -8.1 = 65.61 | 20 - 11.5 = 8.5 = 72.25 | |
9 - 14.1 = -5.1 = 26.01 | 18 - 11.5 = 6.5 = 42.25 | |
12 - 14.1 = -2.1 = 4.41 | 10 - 11.5 = 1.5 = 2.25 | |
15 - 14.1 = 0.9 = 0.81 | 8 - 11.5 = -3.5 = 12.25 | |
18 - 14.1 = 3.9 = 15.21 | 9 - 11.5 = -2.5 = 6.25 | |
25 - 14.1 = 10.9 = 118.81 | 4 - 11.5 = -7.5 = 56.25 | |
Total | 230.86 | 191.53 |
Standard Deviation | 15.19 | 13.84 |
b) Correlation = 119.62 x 3
6-1 x 15.19 x 13.84
=358.86 = 0.34
1051.15
c) b1 = 0.34 x 15.19/13.84 = 0.37
b0 = 11.5 + 0.34 (14.1) = 16.29
d) y = 16.29 + 0.34 x 25 = 24.79
2. a) 70%
b) Joint probability - adults under 50 and bank online.
c)
Bank Online | Don’t Bank Online | Totals | |
Under 50 | 25% | 15% | 40% |
Over 50 | 5% | 55% | 60% |
Totals | 30% | 70% | 100% |
d) 25%
3. a) Midterm 1 Sum: 16805.45
Midterm 2 Sum: 15248.18
Midterm 3 Sum: 15832.8
Final Exam Sum: 15754
b)
[pic 1]
c) Correlation Coefficients:
Midterm 1: 0.599533
Midterm 2: 0.588109
Midterm 3: 0.720151
Line Equations:
Midterm 1: y = 30.58087 + 0.59533 (Midterm 1 Mark), where the slope is 0.59533 multiplied by the mark on Midterm 1, and the intercept is 30.58087.
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