4. *(1 point) three-year Example. The association year-old students in the of ph

Question

4. *(1 point) three-year Example. The association year-old students in the of physical activity and mental city of Oslo, Norway (Aase between weekly hours follow-up study of 15-16 Literature health: A Sagatun, et al. BMC Public Heath, 2007, 7:155. Open Access) Background: Mental health problems are a worldwide public health burden. The literature concerning the mental health benefits from physical activity among adults has grown. Adolescents are less studied, and especially longitudinal studies are lacking. This paper investigates the associations between weekly hours of physical activity at age 15-16 and mental health three years later. The paired t test was used to compare baseline and follow-up scores within boys and girls Below are the results for boys for SDO Emotional Symptoms. Boys Mean SD p-value SDQ Emotional Symptoms 0.183 Baseline 1074 1.64 1.69 Follow up 1082 1.73 1.69 Paired t-test What was the sample size used in the paired t test? A. 1082 B. 1074 C. Cannot be determined

Explanation / Answer

a. The paired t test does not have a defined sample size.

b. To apply t test on differences of mean we must have the distribution of the differences to be approximately normal and variance unknown

c. Here we need to compare the difference of two means, baseline score and follow up score and hence done using a t test.

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