Pearson's r

Which of the following are the Assumptions that underpin a Pearson's correlation?

• The two variables should be measured at continuous level.

• There should be no significant outliners/

• The variables shouldn't be normally distributed.

• There needs to be a non linear relationship between your 2 variables.

Choose the continuous variable from the following

• Height

• Temperature

• Planck's Constant

• Pi

he scatter plot shows the number of books read by students in Ms. Molly’s English class and their final grades. Which statement represents the best description about the line of best fit?w

• The more books students read, the lower their English grade.

• The more books students read, the higher their English grade.

• The fewer books students read, the higher their English grade.

• No relationship exists between the number of books students read and their English grades. 

The scatter plot shows the relationship between the number of chapters and the total number of pages for several books. Use the trend line to predict how many pages would be in a book with 19 chapters. 

• 150 pages

• 170 pages

• 190 pages

• 210 pages

Which statement is true about the given scatter plot?

• It has positive association because all of the points have positive coordinates

• It has negative association because the practice length is always less than the number of baseballs in the cart.

• It has positive association because the practice length is always less than the number of baseballs in the cart.

• It has negative association because as the practice length increases the number of baseballs decreases.

Achieving a value of +1 or -1 means that:

• There are several data points that show any variation away from this line.

• There is variation around the line of best fit.

• All your data points are included on the line of best fit.

• None of the above

What are the requirements for the Pearson's correlation coefficient?

• Association must be linear

• There should be no outliners in the data.

• Variables should be approximately normally distributed.

• All of the above

What is the Range of values can The Pearson's coefficient take?

• 0 to positive infinite

• negative infinite to 0

• +1 to -1

• Any range of values