Median and Mode
What is the mode of: 6, 2, 3, 5, 3, 2, 3, 3, 3
3
What is the mean of: 1, 5, 6?
4
Is age a qualitative or quantitative variable?
quantitative
What is the first step to find standard deviation?
Find the mean of all the numbers
What is the range: 3, 5, 7, 20, 24
21
What is the mode of: 8, 5, 3, 4, 5, 3, 4, 10, 11
3, 4, 5
What is the mean of: 10, 34, 53, 30?
31.75
Name three ways to collect data
Observation, survey, experiment
What are the two types of formulas for standard deviation?
population and sample
What is the range: 56, 32.4, 50, 43.4, 60.2
27.8
10
A class of 25 students took a science test. 10 students had an average (arithmetic mean) score of 80. The other students had an average score of 60. What is the average score of the whole class?
68
Make a frequency table from these numbers:
4, 5, 2, 1, 4, 7, 4, 5
check
find the standard deviation: 1, 1, 3, 4, 7, 8
sqrt(22/3)
Find the IQR: 58, 61, 64, 66, 67, 68, 70
7
What is the median of: 12, 20, 18, 10, 15, 21, 17, 18
17.5
Scores are weighted like this:
Quiz: 10%, Homework: 10%, Test1: 20%, Test2: 20%, Final Test: 40%
Here are your scores: Quiz: 80%, Homework: 89%, Test1: 79%, Test2: 84%, Final Test: 87%
84.3
What are the two special types of frequency tables?
Relative and cumulative
Find the standard deviation: 10, 15, 17, 18, 20, 24, 29
sqrt(228/7)
Find the IQR: 39, 24, 48, 26, 36, 37, 29, 40, 51, 55, 30, 36, 50, 43, 31
48-30 = 18
Which is a better measure of central tendency: median or mode?
Usually median
How many pounds of mixed nuts selling for $4.75 per pound should be mixed with 10 pounds of dried fruit selling for $5.50 per pound to obtain a trail mix that sells for $4.95 per pound?
27.5
What are the two branches of statistics?
Descriptive and Inferential
Find the standard deviation: 2.5, 3.5, 1, 4.2, 5.6, 8.3
sqrt(32.4/6)
The IQR is 30 and the range is 73, find the missing numbers: __, 26, 30, 43, 49, 49, 55, 58, __, 76, 90