STAT 1040/1045 Exam 2 Review

A cloth tape measure that has been stretched will cause (blank) in fabric measurements.

• Bias

• Chance Error

• Outliers

• A normal distribution

A steel tape measure will give (blank) in its measurements of a board.

• Bias

• Chance Error

• Outliers

• Skewness

Estimate the correlation coefficient of the data:

• r = 0.9

• r=0

• r = 0.5

• r = -0.5

My slope will always have the same sign as the correlation coefficient.

• True

• False

A correlation of 0 means that the data have no relationship.

• True

• False

Based on this graph, I claim that eating more meat causes higher rates of colon cancer in women. What do you think?

• (A) Correlation is not causation, this is an incorrect assumption.

• (B) Ecological correlation is occurring, the relationship is inflated.

• (C) My interpretation is correct.

• (D) Both A and B are correct.

Adding or multiplying the same number to x or y changes the correlation coefficient.

• True

• False

R changes if I manipulate or remove only some points in the data.

• True

• False

Estimate the point of averages from the scatterplot

• avex = 10, avey = 98

• avex = 98, avey = 10

• avex = 13, avey = 100

• avex = 8, avey = 99

Estimate the SD for x and y.

• SDx = 5, SDy = 2

• SDx = 10, SDy = 4

• SDx = 10, SD, = 2

• SDx = 5, SDy = 4