1. A researcher is interested in the effect of prenatal alcohol exposure on birt

Question

1. A researcher is interested in the effect of prenatal alcohol exposure on birth weight in rats. She hypothesizes that alcohol will have some sort of effect, either increasing or decreasing the weight of baby rats. She knows that this species of rat normally produces babies that average a weight of 18 grams, with a population standard deviation of 6 grams. She then compares the weight of n 16 rat babies, whose mothers were exposed to alcohol during pregnancy, and finds the average weight of this sample is x 14.

Explanation / Answer

here as confidence interval is not given we would consider it as 0.05 .

d) hence it should be 5%

e) standard errorr =std deviation/(n)1/2=1.5

f)z stat=(X-mean)/std error =(14-18)/1.5 =-2.6667

g) as critical value for 0.05 level are +/- 1.96

and hence our calculated z stat falls in rejection region wewill reject null hypothesis

h) we can conclude that alcohol consumption reducess weight of babies

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