Cortisol is a hormone that plays an important role in mediating stress. There is

Question

Cortisol is a hormone that plays an important role in mediating stress. There is growing awareness that expo-sure of outdoor workers to pollutants may impact cortisol levels. The article "Plasma Cortisol Concentration and Lifestyle in a Population of Outdoor Workers" (Intl. J. of Envir. Health Res., 2011: 62 - 71) reported on a study involving three groups of police officers: (1) traffic police (TP), (2) drivers (D), and (3) other duties (0). Here is summary data on cortisol concentration (ng/ml) for a subset of the officers who neither drank nor smoked. Assuming that the standard assumptions for one-way ANOVA are satisfied, carry out a test at significance level .05 to decide whether true average cortisol concentration is different for the three groups.

Explanation / Answer

H0:

All the three groups has same true average cortisol concentration.

Ha:

All the three groups do not have same true average cortisol concentration.

Folloiwng is the output of one way analysis generated by excel:

Since p-value is greater than 0.05 so we fail to reject the null hypothesis.

Source df SS MS F P-value Between 2 11223.5263 5611.7632 2.6935 0.0714 Within 130 270845.35 2083.4258 Total 132 282068.8763

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