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The mean crying time of infants during naptime at a local preschool is 12 minutes. The...

The mean crying time of infants during naptime at a local preschool is 12 minutes. The school implements a new naptime routine in a sample of 25 infants and records an average crying time of 8±4.6 (M±SD) minutes. Test whether this new naptime routine reduced crying time at a .05 level of significance.

A) the new naptime routine significantly reduced crying time, t(24)= -4.35, p < .05
B) the new naptime routine did not reduce crying time, t(24)= -4.35, p < .05
C) the new naptime routine did not reduce crying time, t(24)= 0.92, p > .05
D)the new naptime routine significantly reduced crying time, t(24)= 0.92, p <.05

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TOPIC:One sample t-test for the population mean.

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