The following table shows the number of years of school, x, completed by ten ran
ID: 3232511 • Letter: T
Question
The following table shows the number of years of school, x, completed by ten randomly selected people and their scores on a test measuring prejudice, y. Use the data to find the equation that relates years of education and scores on a prejudice test. If convenient, use technology to find the equation. (Round value to two decimal place.) A. y = -.07x + 11.54 B. y = -.43x + 7.7 C. y = -4x + 9.2 D. y = -0.60x + 11.63 Using the scatter plot of the registered nurse salary data shown, what type of correlation, if any do you think the data have? Explain. A. There appears to be a strong negative linear correlation. As the years of experience of the registered nurses increase, salaries tend to decrease. b. There appears to be a strong positive linear correlation. As the years of experience of the registered nurses increase, salaries tend to decrease. C. There appears to be a strong positive linear correlation. As the years of experience of the registered nurses increase, salaries tend to increase. D. There does not appear to be any linear correlation.Explanation / Answer
Q.8 I have used both technology and both least regression formulas
y = a+ bx
a = [( y)( x2 ) - (x)( xy)]/[n( x2) - ( x)2 ]
a = [61 * 1078 - 92 * 422]/ [ 10 * 1078 - 922 ] = 26934/2316 = 11.63
b = [n (xy) - (x)( y)] /[n( x2) - ( x)2 ] = [10 * 422 -92 * 61] / [ 10 * 1078 - 922 ] = -1392/2316 = -0.601
y = -0.601x + 11.63
Option D is correct.
Q.9 Option C is correct. as there is strong positive linear correlation. As the years of experience of registered nursses increase, salaries tent to increase. we can see there is very strong positive relation and salaries are increase with experience.
Respondent Years of school (x) Score on Test (y) x^2 xy A 13 4 169 52 B 5 9 25 45 C 16 2 256 32 D 4 9 16 36 E 15 2 225 30 F 6 7 36 42 G 5 10 25 50 H 3 9 9 27 J 11 6 121 66 K 14 3 196 42 sum 92 61 1078 422Related Questions
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