Two types of football helmets, padded and suspension were compared to determine

Question

Two types of football helmets, padded and suspension were compared to determine which had the lowest rate of impact damage. Forty helmets of each type were randomly selected and subjected to an impact test. The damage rates were 0.14 for padded and 0.45 for suspension. A 95% confidence interval estimate for the difference in the damage rates of the two types of helmets (padded minus suspension) is (-0.498. -0.122). After noticing that "0" is not included in the interval given and that both numbers are negative, what can you conclude what about the damage rates between the types of helmets? Be very specific and address context.

Explanation / Answer

Since zero is not included in the confidence interval so we cannot conclude that there is no difference in the damage rates of two types of helmet. Since all the numbers are negative so we can conlcude that damage rate is greater for suspension helmet.

And we are 95% confidence that the difference between the damage rates lies in the given confidence interval.

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