Constructing a Normal Model with the Empirical Rule

What is another name for the empirical rule?

• The 50-50 Rule

• The 68-95-99.7 Rule

• The Bell Curve Rule

• The Standard Deviation Rule

When is the normal model used?

• When data is bimodal and skewed

• When data is unimodal and symmetric

• When data is random and unstructured

• When data is multimodal and asymmetric

In the chipmunks and acorns example, what is the mean number of acorns a chipmunk can fit in its mouth?

• 24

• 18

• 30

• 36

What percentage of data falls within one standard deviation of the mean in a normal distribution?

• 50%

• 99.7%

• 95%

• 68%

How much of the data is considered unusual in statistics?

• Beyond four standard deviations

• Beyond one standard deviation

• Beyond two standard deviations

• Beyond three standard deviations

What is the z-score for a value that is one standard deviation above the mean?

• 0

• 1

• 2

• 3

If a chipmunk can fit 30 acorns in its mouth, what percentile does it fall into?

• 50th percentile

• 68th percentile

• 84th percentile

• 95th percentile

What is the term for the number of standard deviations a data point is from the mean?

• Percentile

• Quartile

• Z-score

• Deviation Index

What percentage of data falls within two standard deviations of the mean in a normal distribution?

• 100%

• 99.7%

• 95%

• 68%

What is the empirical rule used for in statistics?

• To determine the mode

• To find the median

• To describe the spread of data in a normal distribution

• To calculate the mean