Finding the Highest Mean rate

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A psychologist studying the rate at which infants in three different countries vocalized distress obtained the scores below from each country. Which group of infants showed the highest mean rate of distress vocalization?

Country A          9, 9, 10, 13, 8, 8, 11, 11, 10, 7

Country B          15, 15, 16, 9, 14, 14, 17, 17, 16, 13

Country C          4, 6, 20, 17, 15, 21, 18, 18, 25, 2

Mar 30th, 2015

Country A  : sum = 96  ; Mean =9.6

Country B : sum =146  ; Mean =14.6

Country C : sum =146 ; Mean= 14.6

Group of infants from country B and country C showed highest mean rate of distress vocalization.

But the standard deviation of country B is 2.37

The standard deviation of country C is  7.83

We can say country B is more consistent and has high mean rate.

Country C is somewhat erratic . There are quite a few children with low distress.

Mar 30th, 2015

Thank you. 

Mar 30th, 2015

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