Chp 3 Review

Front

What is the mean age of sales people in Foot Locker?

Back

30 years.

Front

What is the standard deviation of the ages of sales people in Foot Locker?

Back

6 years.

Front

According to Chebyshev's Theorem, what fraction of data lies within k standard deviations of the mean?

Back

At least 1 - \frac{1}{k^2}.

Front

What does a Z-score of +2.5 indicate about a student's performance?

Back

The student scored 2.5 standard deviations above the average.

Front

What percentage of students have a GPA between 2.3 and 3.5 if the GPA is normally distributed with a mean of 2.9 and standard deviation of 0.6?

Back

68%.

Front

What is the definition of the 55th percentile in a test score context?

Back

55% of the class scored as good or worse than the student.

Front

What is the Empirical Rule in statistics?

Back

In a normal distribution, approximately 68% of data falls within 1 standard deviation of the mean.

Front

What is the Range Rule of Thumb?

Back

The range of a data set is approximately 4 times the standard deviation.

Front

What does it mean if a data point has a Z-score of -1?

Back

The data point is 1 standard deviation below the mean.

Front

What is the formula for calculating the standard deviation?

Back