Math Measurement and Data

Question 1

Mean

Answer 1

The average. Add all numbers in a set or list and divide by how many numbers are in a set. Ex: 3+3+3+7+9+9+14= 56/8=7

Question 2

Measures of Central Tendency

Answer 2

Mean is commonly known as the average, median the middle value, and mode repeated most often.

Question 3

Median

Answer 3

Median is the middle number of an ordered list. Odd number of terms there is 1 number. Even number of terms there are 2 middle numbers., so mean of 2 numbers is the median. Ex: 3+3+3+7+8+9+9+14. 7+8/2= 15/2= 7.5

Question 4

Mode

Answer 4

Mode is the number in a list that occurs most often. If a list includes two modes, it is bimodal. Ex: 3,3,3,7,8,9,9,14 =3

Question 5

Range

Answer 5

Range is one measure of the spread for a data set. To find the range, subtract the minimum value from the maximum value. Sometimes referred to as the absolute difference, meaning the absolute difference of 2 numbers. Ex: 14-3=11 ; 11 is the range.

Question 6

Bimodal

Answer 6

Describes a distribution of data with 2 clear peaks.

Question 7

Standard Deviation

Answer 7

Describes how data varies from the mean. High Standard Deviation, indicates data is spread out. Low Standard Deviation, indicates data set where values are closer to the mean.

Question 8

Unimodal

Answer 8

Describes distribution of data with a single clear peak. Example. Bell Shape Curve

Question 9

Shape

Answer 9

Symmetry, number of peaks. skewness, and uniformity of data distribution.

Question 10

Symmetric Distribution

Answer 10

Single peak at center. “Bell Shaped”and Unimodal is also known as “normal distribution.”

Question 11

Skewness

Answer 11

Graphic distributions that have observations that fall on the right or left side of the graph. Skewed right- Distributions with fewer observations on the right are toward higher values. Skewed Left- Distributions with fewer observations on left are toward lower values.