Question 287742
An elementary school claims that the standard deviation in reading scores of its fourth grade students is less than 3.15. Determine whether the hypothesis test for this claim is left-tailed, right-tailed, or two-tailed.
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Ho: u >= 3.15
Ha: u < 3.15 (claim)
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Since Ha is "less than" it is a left-tail test.
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Cheers,
Stan H.