A researcher measures the relationship between the number of interruptions durin

Question

A researcher measures the relationship between the number of interruptions during a class and time spent "on task" (in minutes). Answer the following questions based on the results provided.

Part (a)

Compute the Pearson correlation coefficient. (Round your answer to three decimal places.)
1

Part (b)

Multiply each measurement of interruptions times 3 and recalculate the correlation coefficient. (Round your answer to three decimal places.)
2

Part (c)

Divide each measurement in half for time spent "on task" and recalculate the correlation coefficient. (Round your answer to three decimal places.)
3

Part (d)

True or false: Multiplying or dividing a positive constant by one set of scores (X or Y) does not change the correlation coefficient. Note: Use your answers in (a) to (c) to answer true or false.

True False    

Explanation / Answer

a) Let the data stored in excel from A1: B4

Use excel function

CORREL(A1:A4,B1:B4)

= -0.801

B) If we Multiply each measurement of interruptions times 3 then even correlation is -0.801

c) Divide each measurement in half for time spent "on task" then correlation is -0.801

d) True. Multiplying or dividing a positive constant by one set of scores (X or Y) does not change the correlation coefficient

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