Question

A consumer magazine listed the price in dollars) and power (in cold cranking amps) of auto batteries. A test is run to determine if more expensive batteries are generally better in terms of starting power. Use the technology output given below to answer parts a) through g). Click the icon to view technology output. b) Are the conditions for inference satisfied? Explain. Select all conditions for inference that are satisfied. O O A. The scatterplot of the data is roughly linear with lots of scatter. B. Normal probability plot of residuals is reasonably straight. C. The residual plot and the scatterplot show consistent variability D. The plot of the residuals looks random. E. None of the assumptions and conditions for inference are satisfied.

Answer 1

Solutionc:

H0:no relationship between cost and power
B1 = 0

Ha:there exists a relationship between cost and power
0718

OPTION D

t=3.230

p=0.0049

p<0.05

Reject Ho.The data provide evidence of a linear relationship between cost and power

MARK OPTION D

Solution-d"
R sq=38.0%

only 38% variation in power is explained by cost

very less

No the association is not strong,because the value of R sq is only 38%.This low value of R sq and high value of s,111.1 indicates that most of the variation is not explained by this regression.

MARK OPTION C

Solution-e

power=327.162+4.74096*cost