Unit 5 Day 2 Correlation Practice #1

What are the three conditions that need to be met before calculating/using the correlation coefficient?

Select the correlation values that show a weak condition:

Hint: there are 4

Select the correlation values that show a strong condition:

Hint: there are 3

A group of ten adults were studied. Their height, weight and age were recorded.

Use the following table with age and weight data to create a scatterplot in your Ti-84: stat, edit, L1 & L2,

then Statplot (2nd, y=), select the scatterplot, make sure plot #1 is ON, ZoomStat (#9).

Use the 'show your work' to roughly sketch the scatterplot using the scribble tool (second box in the tool bar on the left). You can increase the size/color of the dots with the top box in the tool bar.

A group of ten adults were studied. Their height, weight and age were recorded.

Using the scatterplot created for question #4, describe the relationship between age and weight.

A group of ten adults were studied. Their height, weight and age were recorded.

Using the scatterplot created for question #4, interpret the relationship between age and weight.

A group of ten adults were studied. Their height, weight and age were recorded.

Use the scatterplot from #4, is it appropriate to calculate the correlation coefficient?

Enter your answer as 'yes' or 'no'.

A group of ten adults were studied. Their height, weight and age were recorded.

Using the data from #4 and your Ti-84, calculate the correlation coefficient.

Stat, Calc, #8 LinReg (a+bx)

Enter your answer below, round the correlation coefficient to three places past the decimal.

A group of ten adults were studied. Their height, weight and age were recorded.

Use the following table with height and weight data to create a scatterplot in your Ti-84.

Use Xlist: L3 (2nd, 3) for the height data, keep Ylist the same.

Use the 'show your work' to roughly sketch the scatterplot using the scribble tool (second box in the tool bar on the left).

You can increase the size/color of the dots with the top box in the tool bar.

A group of ten adults were studied. Their height, weight and age were recorded.

Using the scatterplot created for question #9, describe the relationship between height and weight.

A group of ten adults were studied. Their height, weight and age were recorded.

Using the scatterplot created for question #9, interpret the relationship between age and weight.

A group of ten adults were studied. Their height, weight and age were recorded.

Use the scatterplot from #9, is it appropriate to calculate the correlation coefficient?

Enter your answer as 'yes' or 'no'.

A group of ten adults were studied. Their height, weight and age were recorded.

Using the data from #9 and your Ti-84, calculate the correlation coefficient.

Stat, Calc, #8 LinReg (a+bx)

Round the correlation coefficient to three places past the decimal.

Compare the correlation coefficients calculated in #8 & #13:

1. Which shows a stronger linear relationship?

2. How do you know?

Select two answers.