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To determine whether the standard deviation of sbp of female 110m - hurdlers is 4, or not, a hypothesis test with significance 0.05 is

To determine whether the standard deviation of sbp of female 110m - hurdlers is 4, or not, a hypothesis test with significance 0.05 is done. A sample of 18 should have a sample standard deviation between which two values to retain the null hypothesis?

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