Question

1. Gibbs Baby Food Company is comparing the weight gain of infants using its brand versus its competitor’s brand. A sample of 20 babies using the Gibbs products revealed a mean weight gain of 7.6 pounds in the first three months after birth. For the Gibbs brand, the sample standard deviation is 2.3 pounds. A sample of 28 babies using the competitor’s brand revealed a mean increase in weight of 8.1 pounds. The sample standard deviation is 2.9 pounds. At the 0.05 significance level, we challenge that babies using the Gibbs brand gained less weight. ___tail

Ho:

Ha:

Decision:

SKETCH YOUR WORK.

Answer 1

Page No. Date II Giren Gibbs product competitor's Brand ni= 20 = n₂ = 288 = 7.6 łza 8.1 sic 2.3 Sq - 2.9 x=-0.05 Left talled Test Hoi eli-l2 vis Hi..Mic M2 - under Hog Test statistic is 24- a 7 -6-811 t - s2 s2 = [(2.3)2 (2.972 - I hit n2 V 20 20 72 - t= -0.5 - 0.66 0.7516 d. d = minnil, n2-1) = 19 critical values = txdof. = tas d.4 C atoos, 19 .-1.7291 Here -1.72 no ts tont, Fail to Reject Ho ...6 Hence there is not enough evidance to conclude that the the Gibbs Brand gain less A weight.