If a Scatter Plot of Variables X and Y Shows

question 100

Multiple Choice

If a scatter plot of variables X and Y shows a trend that can be summarized to a large degree by a straight line with slope 0.8 and y-intercept 0.2 (i.e., Y = 0.2 + 0.8X) , then the correlation coefficient between X and Y is ______.

• A)0.8, and there is a causal relation between X and Y (either X causes Y or Y causes X)
• B)0.2, and there is a causal relation between X and Y (either X causes Y or Y causes X)
• C)0.8, but there is no causal relation between X and Y
• D)0.2, but there is no causal relation between X and Y
• E)0.8, and there may be a causal relation between X and Y, but not necessarily

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Definitions:

Unified National Code

A thread standard used in the United States and Canada for bolts, screws, and nuts, specifying the shape, angle, diameter, pitch, and length of threads.

Abbreviation

A shortened form of a word or phrase used to save space or avoid repetition.

Hexagon

A polygon with six edges and six vertices, often seen in tools, nuts, and bolts due to its efficient load distribution and ease of wrenching.

Spotface

A localized, flat surface machined on a part, typically around a hole, providing a seating surface for a fastener or bearing.