Finding the Highest Mean rate

Statistics
Tutor: None Selected Time limit: 1 Day

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

Are you studying on the go? Check out our FREE app and post questions on the fly!
Download on the
App Store
...
Mar 30th, 2015
...
Mar 30th, 2015
Dec 3rd, 2016
check_circle
Mark as Final Answer
check_circle
Unmark as Final Answer
check_circle
Final Answer

Secure Information

Content will be erased after question is completed.

check_circle
Final Answer