A researcher records the crying time (in minutes) of infants given oral administ

Question

A researcher records the crying time (in minutes) of infants given oral administration of sucrose (n = 12) or tap water (n = 16) prior to a heel prick. The mean crying time in the sucrose group was 3.3 minutes, with a standard deviation of 2.4. The mean crying time in the tap water group was 7.3 minutes, with a standard deviation of 1.6. If the null hypothesis is that there is no difference in crying time, then what is the decision for this test? Select one: a. Crying time was significantly reduced among infants given the water solution prior to a heel prick. b. Crying time was not reduced among infants given the sucrose solution prior to a heel prick. c. Crying time was significantly reduced among infants given the sucrose solution prior to a heel prick. d. Crying time was the same in both groups.

Explanation / Answer

The statistical software output for this problem is:

Two sample T hypothesis test:
1 : Mean of Population 1
2 : Mean of Population 2
1 - 2 : Difference between two means
H0 : 1 - 2 = 0
HA : 1 - 2 0
(without pooled variances)

Hypothesis test results:

Since p - value is very small, we can reject Ho and conclude that crying time was significantly reduced among infants given the sucrose solution prior to a heel prick.

Option C is correct.

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