Bivariate Data Analysis

The table below shows the age (in months) and the height (in cm) of a young plant.

Is predicting the height of the plant after 3 years an example of interpolating or extrapolating?

Answer explanation

3 years = 36 months --> outside the range data.

What is the slope of the least-sqaures regression line given m=\frac{s_y}{s_x},\ r=0.733,\ s_x=1.871\ and\ s_y=3.391 ?

• 0.41

• 0.45

• 1.33

• 1.87

How many males are usually sad?

• 11

• 9

• 86

• 211

How many females were surveyed?

• 125

• 124

• 86

• 211

Does this graph indicate an association?

• Yes

• No

• Maybe

Does this graph indicate an association?

• Yes

• No

• Maybe

Does this graph indicate an association?

• Yes

• No

• Maybe

To assess an association you should look for variation:

• Across the rows

• Down the columns

• At the total

To assess an association you should look for variation:

• Across the rows

• Down the columns

• At the total

The response variable is?

• Gender

• Emotion

• Males

• Females