(1 point) Studies suggest that women who smoke duing pregnancy affect the ourth
ID: 3313668 • Letter: #
Question
(1 point) Studies suggest that women who smoke duing pregnancy affect the ourth weights of their newoom infants. To study this issue further, a sample of 10 women smokers were asked to estimate the average number of cigarettes they smoke per day In the tolowing table are their estimates and the birth weight (in kgs) of their child 2.91 3 27 3 68 3.14 2 32 3.82 3.45 2.95 3.00 3 68 19 16 (a) Using MINITAB, create a scatter-plot of the data. What can you conclude trom this scatter plor? s not a inear relationship between the average number of cigarettes the mother consumes and the bithweight of her chid B. There is a positive lnear relationship between the average number of cigarettes the mother consumes and the c. There is a nepaive linear relatishipbetween the average number of cgarethes the mother consumes and the tulthweight ofner chald birthweight of her child (b) Use MINITAB to find the least squares estimate ot the linear modei that expresses the birth weight of a child as a linear average number of cigarettes mom consumes in a day Use tour decimals in each of your answersExplanation / Answer
a) Correct answer: Option (C)
b) The regression equation is
Y = 3.89 - 0.0367 X
c) R-Sq = 0.7874
the percentage of 78.74% in the birth weight of the child is explained by the linear relationship with the average number of cigareetes consumed in a day
d) As Slope (the average number of cigareetes consumed in a day) increaseed by 1 unit(cigareet) then weight of the child will be decreased by 0.0367
e) If X = 20
then Y = 3.89 - 0.0367 (20) = 3.156
f) ei = 4.2-3.156 = 1.044
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