Week 4 - Analysis of Numerical Data

Question 1

What is another word for Mean?

Answer 1

Average

Question 2

Define Median?

Answer 2

middle value in a set of data that has been ordered from lowest to highest

Question 3

Define Mode?

Answer 3

is the value in a data set that appears most frequently

Question 4

What are resistant measures?

Answer 4

Extreme values don’t affect the median, mode and IQR.

Question 5

Do extreme values affect the Mean?

Answer 5

Yes

Question 6

Define Lower Quartile (LQ)?

Answer 6

value at 25% of the data set

Question 7

Define Upper Quartile (LQ)?

Answer 7

value at 75% of the data set

Question 8

Define Spread?

Answer 8

the amount of scattering of data values

Question 9

Define Range?

Answer 9

the difference between the highest and lowest value.

Question 10

Define Interquartile Range (IQR)?

Answer 10

difference between the upper and lower quartile

Question 11

Define Variance?

Answer 11

measure of variation between based on squared deviations from the mean; directly related to the standard deviation.

Question 12

Define Standard Deviation?

Answer 12

measure of variation based on squared deviations from the mean; directly related to the variance.

Question 13

Define Coefficient of variation?

Answer 13

relative measure of variation; the standard deviation divided by the mean.

Question 14

Define Z scores?

Answer 14

measures of relative standing; number of standard deviations that given data values are from the mean.

Question 15

Define Normal Distribution?

Answer 15

continuous probability distribution represented by a bell-shaped curve