Measures of Center
Measures of Variability
Sampling and Surveys
Reading Graphs
100
Find the mean of the following data set:
3, 4, 5, 6, 7
5
100
Find the range of the following data set:
3, 10, 9, 11, 14, 93, 1, 3, 113
112
100
If I want to choose five of my seventh grade students and I do so by pulling five names out of a hat without looking, what kind of sampling am I using?
A. simple random sample
B. systematic random sample
C. random biased sample
D. convenience sample
A.
100
The graph shows the music preferences of a sample of students at a school. How many more students like Classical/Soundtracks more than Dubstep/Electronic?
7.
200
Find the mean, median, and mode of the following data set:
7, 9, 11, 3, 5, 7
mean = 7
median = 7
mode = 7
200
Find the interquartile ranges of each set of data:
Room 14 IQR = 15
Room 12 IQR = 10
200
You want to conduct a survey to determine whether or not olives should be added to the pizzas sold in the school cafeteria. Which sampling method would be best?
A. interview every vegetarian student
B. interview every student at a pizza shop in town
C. interview every student who eats lunch in the cafeteria
D. interview every student who brings lunch from home.
C.
Because while B may look like a good answer, the opinion of those who eat in the cafeteria is most valuable here.
200
The following is a breakdown of your penny collection. If you take 1 penny from your jar at random, what is the probability that the date will be earlier than 1980?
5/15 = 1/3
300
Write a data set of any 5 numbers that has a median equal to 8.
Infinite answers.
300
The mean of the following data set is 21. Find the mean absolute deviation:
18, 25, 15, 28, 19, 21
3 2/3
300
A transportation consultant did a random sample of airline arrivals and found that 18 out of 100 arrivals were late. Based on these results, how many late arrivals would you expect to see in 25,000 flights?
4,500
300
What is the name of this mathematical diagram? Does the data show a correlation? What kind?
It is a scatter plot showing a positive correlation (as x increases, y increases).
400
Write a data set of 5 numbers that has a mean equal to 5.
Infinite answers.
400
Find the mean absolute deviation of the following set:
78, 45, 60, 33, 84
MAD = 16.8
400
This bar graph shows the number (in hundreds) of students at three different schools. Explain how this graph could be misleading.
This graph makes it look like school 3 has significantly more students than schools 1 or 2, but really, they are all within 150 of each other.
400
What month does each city have maximum snowfall?
New York: January
Chicago: March
500
Find the MEAN, MEDIAN, MODE, and RANGE of the following data.
mean = 4.21
median = 5 cubic yards
mode = 5 cubic yards
range = 6 cubic yards
500
Write a data set of any 5 numbers that has...
- a range equal to 9
- a mode equal to 7
- a mean equal to 10
7, 7, 8, 12, 16
or
7, 7, 9, 11, 16
500
Random algebra question:
Solve for x:
24 + 1/3x = 14 - 2/3x + 5
x=-5
500
Which brand has a higher mean? Which is more consistent?
Brand X has a higher mean, but Brand Y is more consistent.