Measures of Center & Variability
The mode is the ______ frequent number.
most
What are the measures of center?
Mean, Median, Mode
Name the 5 parts of the 5 number summary.
Min, Q1, Median, Q3, Max
Determine the sample method.
Randomly put students names into a basket then pick names out to be in the survey.
Random
All of the angles inside of a triangle must add up to...
180 degrees
What must you do when you are finding the median, and get stuck with two number in the middle?
Add both the numbers, then divide by 2
Find the median.
{4, 5, 10, 6}
5.5
An ______ is a min or max that is very far away from the rest of the data.
outlier
Determine the sampling method.
Survey every 8th student in the auditorium.
Systematic
Convert 4/22 to a decimal, then percent.
Round correctly!
18%
Calculate the range.
{4, 5, 6, 3, 24}
21
If trying to determine which student scored better on tests, what should you calculate for each student?
The mean (average)
min and max
Q1, median, Q3
What percent of the population should be used to make an appropriate sample size?
10%
Boys in class=10
Total students in class=25
Find percent of boys in class.
40%
Calculate the mean
{4, 5, 7, 12}
7
Which of the measures of center did Miss Malseed say DOES NOT tell you much about the data?
Median
There are 4 parts to a box and whisker plot. Each part of the plot is equal to what percent?
25%
Determine the sampling method.
Asking students to go onto the Ridley website to complete an online poll.
Voluntary-Response
Green animals in the creek=40
Total animals in creek=150
Find percent of green animals in creek.
27%
What are the 3 steps to find the MAD.
Calculate the mean of the data. Find the distance that each number is from the mean. Find the mean of the distances.
Describe how to find the mean, median, mode, and range.
Mean - add all numbers, then divide
Median - list least to greatest, then find middle
Mode - most frequent number
Range - Max - min
Calculate Q1, median, and Q3.
{0, 2, 5, 7, 9, 13}
Q1 = 2
Median = 6
Q3 = 9
Name the 4 types of sampling methods and state which one of the 4 methods represents the data the best.
Random, Systematic, Convenience, Voluntary-Response. Random is most representative of the data.
Complementary angles add up to 90 degrees, while supplementary angles add up to 180 degrees.