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Problem 2

 

9.4 t-Test to Compare Two Population Means: Independent Samples (Equal Variances)

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Problem 4

A study looked at the relationship between low birth weight and IQ.  A random selection of 17 low birth weight had an average IQ of 95.5 points with a standard deviation of 16.  A random selection of 19 normal birth weight children had an average IQ of 104.9 points with a standard deviation of 14.2. Use a 0.10 significance level to test the claim that the two groups of children have the same average IQ (assume equal variances). 

 

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