Gibbs Baby Food Company wishes to compare the weight gain of infants using its brand versus its competitor's. A sample of 40 babies using the Gibbs products revealed a mean weight gain of 7.6 pounds...

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Gibbs Baby Food Company wishes to compare the weight gain of infants using its brand versus its competitor's. A sample of 40 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 population standard deviation of the sample is 2.3 pounds. A sample of 55 babies using the competitor's brand revealed a mean increase in weight of 8.1 pounds. The population standard deviation is 2.9 pounds.

Answered Same DayDec 24, 2021

Answer To: Gibbs Baby Food Company wishes to compare the weight gain of infants using its brand versus its...

Robert answered on Dec 24 2021
111 Votes
Test: µ1 6= µ2 using two sample z-test
Hypothesis test:
H0 : µ1 − µ2 = 0 (Null Hypothesis)
Ha : µ1 − µ2 6= 0 (Alternative Hypothesis, also called H1)
This is two tailed test.
sample 1 sample 2
x1 = 7.6 x2 = 8.1
σ1 = 2.3 σ2 = 2.9
n1 = 40 n2 = 55
Significance Level, α = 0.05 (If no value is given, we take level of 0.05)
Since Variances are known, we...
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