18) The equation of a regressionline is y\' = 4.6 + 3.2. what is the intercept o

Question

18) The equation of a regressionline is y' = 4.6 + 3.2. what is the intercept of this line? 18 A)-4.6 B) 4.6 C) 0 D) 3.2 19) Samples were drawn from three populations. The sample sizes were n 8, n2-5, and 1 n3 = 9. The sample means we re,-1.61, x-2.09, and x-1.50. The sam ple standard deviations were si-033, s,-0.25, and s3-0.45. The grand mean is x = 1.674091 . Can you conclude that two or more of the population means are different? Use the = 0.01 level of significance - B) Yes A) No 20) A correlation coefficientr was calculated to be 0.830. The coefficient of nondetermination would be 0.170. B) True A) False

Explanation / Answer

18 ) intercept is when x= 0
y = 4.6

20)
The coefficient of nondetermination is the proportion of variationwhich cannot be explained by the regression i.e. the 'error'coefficient. It can be calculated by dividing the unexplainedvariation by the total variation, or alternatively1-r2.

Hence:
Coefficient of nondetermination = 1 - r2
                                               = 1 - (0.83)^2
=0.3111
hence False

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