Samples and Surveys
Customers at a diner are surveyed to determine the number of times local people eat out in a week. What is the population?
local people
List the values of this stem and leaf plot:
1/2,5,6,8
2/3,6,8
3/0,0,3,5
12,15,16,18,23,26,28,30,30,33,35
What is the mean of the following numbers:
4,8,8,3,6,8,3
5.7
What is the range of this group of numbers:
85,92,78,88,90,88,89
14
Go to the board and draw a frequency chart for the following numbers:
1,3,2,5,5,1,2,3,3,
1-2
2-2
3-3
5-2
Customers at a diner are surveyed to determine the number of times local people eat out in a week. what is the sample?
customers at a diner
Within 30 seconds, make a stem and leaf plot for the following with a key - at the board-
44,48,49,50,52,53,55
Key: 4/4=44
4/4,8,9
5/0,2,3,5
What is the mode for these numbers:
15,12,18,11,15,18,25,15,11
15
Give me the first quartile number for the following:
85,92,78,88,90,88,89
85
Go to the board and draw a bar graph for the following numbers:
1,3,2,5,5,1,2,3,3,
bar graph with numbers 1,2,3,4,5 listed.
Customers at a diner are surveyed to determine the number of times local people eat out in a week. What is the bias?
people already eating out are more likely to eat out than others
What could the key be for this data:
1/3,4,5
2/1,4,7
3/4,5,8
Sample: 3/4 = 34
What is the median of these numbers:
35,21,34,44,36,42,29
43
Give me the third quartile number from this list:
85,92,78,88,90,88,89
90
True or False:
Every graph or table needs to have a consistent set of data when graphing
True
What type of sampling method is this?
Commuters on a subway are selected at random and asked their favorite ice cream.
random
Go to the board and write a stem and leaf plot for the following information:
6, 8, 14, 17, 22, 25
0/6,8
1/4,7
2/2,5
Give me the mean, median, AND mode of the following:
5,2,12,7,13,9,8
mean 8
median 8
mode: none
Give the range for these numbers:
84,95,76,88,92,78,98
22
True or False:
If a scatter plot shows the dots decreasing, this is a positive correlation?
False
What type of sampling method is this?
The register receipt of every 10th shopper at a grocery store is automatically compiled into a data base of the total amount spent and items purchased.
systematic
Create a double stem and leaf plot with 8 numbers and a KEY for your numbers.
Answers with vary
Give the mean, median, and mode of the following:
6,8,6,7,9,2,4,22
mean - 8
median - 6.5
mode - 6
Give the range, first quartile number and third quartile number for the following list:
2,7,9,12,2,6,8,1
Range - 11
1 quartile - 2
3rd quartile - 8.5
Is this a positive or negative correlation:
The size of a bag of popcorn and the price of the popcorn.
Positive correlation