Statistics Chapter 6 test

Front

What does a strong correlation between grade point average and whether or not a student works imply?

Back

There is a relationship between students' GPA and their employment status.

Front

Why is r = 0 in a scatterplot with a strong relationship between x and y?

Back

Because the relationship is not linear, so the correlation coefficient does not capture it.

Front

Association shown in the scatterplot of Olympic Gold Medal Times for the Men's 1500m run over the years?

Back

The times have generally decreased over the years, indicating that athletes are running faster.

Front

Which value of r best represents the correlation? Options: –0.8, –0.3, 0.5, 0.9

Back

–0.8

Front

What is wrong with the statement: The correlation between Olympic gold medal times for the 800m hurdles and year is –0.66 seconds per year?

Back

Correlation is unitless and should not be expressed in seconds per year.

Front

What is wrong with the statement: The correlation between Olympic gold medal times for the 100m dash and year is –1.37?

Back

Correlation coefficients must be between -1 and 1.

Front

What is wrong with the statement: Since the correlation between Olympic gold medal times for the 800m hurdles and 100m dash is –0.41, the correlation between times for the 100m dash and the 800m hurdles is +0.41?

Back

The correlation between two variables is the same regardless of the order.

Front

What is wrong with the statement about measuring Olympic gold medal times for the 800m hurdles in minutes instead of seconds?

Back

Changing the units of measurement does not affect the correlation coefficient.

Front

What shape is a normal distribution curve?

Back

Bell curve

Front

If the shaded area under the curve is .85, what is the other missing portion of the curve?

Back

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