Statistics Chapter

The mean age of sales people in ABC Dept. Store is 30 years with a standard deviation of 6 years. Between which two age limits must at least 75% of the data lie?

• 24 - 36 years

• 18 - 42 years

• 12 - 48 years

• 6 - 54 years

Using Chebyshev's theorem. With a mean of 80 and a standard deviation of 5 at least what percentage of values will fall between 65 and 95? WHAT IS THE K VALUE ONLY?

• 2

• 3

• 4

• 5

• 6

All of the below sets have the same mean.
Set 1-Standard Deviation=3.1
Set 2-Standard Deviation=4.9
Set 3-Standard Deviation=1.7
Set 4-Standard Deviation=3.2
Which set of data probably has the points closest to the mean?

• 1

• 2

• 3

• 4

If the standard deviation of a data set is 4, what is the variance?

• 2

• 16

• 4

Before you can begin calculating the variance, you must first:

• find the mean

• find the median

• find the mode

• find the range

What is the difference between the formulas for population variance and sample variance?

• The sample variance is the square root of the population variance.

• The population variance divides the sum of the squares by n-1, while sample divides by N.

• The population variance divides the sum of the squares by N, while sample divides by n-1.

• There is no difference.

If I tell you that you scored at the 55th percentile on your final exam, you would know:

• 55% of the class scored the same or worse than you did

• You earned a 55% on the exam

• You failed the exam

• 45% of the class scored worse than you did

If the Mean is multiplied to Coefficient of Variation then the resulting value is classified as

• coefficient of Deviation

• Coefficient of Mean

• Standard Deviation

• Variance

If mean and coefficient of variation of a set of data is 10 and 5, then S.D. is

If the standard deviation of a data set is 4, ______________is the variance?