Question

Abigail gathered data at school among 7th and 8th graders to see if there was an association between gradLeft-handed Right-handed7th grade60908th grade54Abigail found there was no evidence of an association between grade level and handedness. Which of these could b the number of right handed 8th graders

Answer 1

Step 1

Check for a positive or negative correlation.

In this case, a positive correlation means that there is a reduction, and a negative correlation means that there is an increase.

Step 2

Draw a conclusion from step 1

7th graders have 60 left-handers and 90 right-handers

8th graders have 54 left-handers, any value for the right-handers less than 90 represents a positive correlation and above 90 represents a negative correlation.

Since Abigail found that there was no evidence, of an association between grade level and handedness, then the only possible value that shows no correlation is 90.

Hence the right answer is 90

The table will look like