Homework Answers
1)
1.
We know that the 95% confidence interval for difference between population means is given by:
2.
Since the confidence interval contains the value 0, so we cannot
conclude that 
i.e. we cannot conclude that there is a significant difference
between the two population means.
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Using the results below: M1 = 18.57, M2 = 18.33, SM1-M2 = 0.97, tcv = 1.997...
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