Measures of Center
What is the value that appears most frequently in a data set?
Mode
In a survey of 100 seventh-grade students, 75 reported owning a pet. Based on this data, which prediction would be most reasonable?
a. Every student in the school must own a pet
b. About three-quarters of other seventh-grade students likely own pets
c. All future seventh-grade students will definitely own pets
d. Exactly 75% of all people in the city own pets
b. About three-quarters of other seventh-grade students likely own pets
Find the MAD for the data set:
2, 2, 3, 5, 5, 7
1.66666666666........ (the six is repeating)
What 2 types of sampling methods are not random and biased?
1. Voluntary Sample
2. Convenience Sample
Create a box and whisker plot to identify the minimum, maximum, median, lower quartile, and upper quartile for the following data set: 17, 22, 31, 34, 45
Min = 17
Max = 45
Lower Quartile = 19.5
Median/Quartile 2 = 31
Upper Quartile = 39.5
In a data set of 5, 10, 15, 20, and 25, what is the median?
15
The animal department wants to estimate baboon population. So they paint 50 baboons with a mark. These baboons were then released into the jungle. After two months, 300 baboons were caught. Among these baboons, 25 were marked. To the nearest whole number, what is the best estimate for the baboon population?
600 Baboons
Find the MAD for the data set:
1, 2, 3, 4, 4, 5, 5, 6, 9
1.703703703..... (the 703 are repeating)
What 2 types of sampling methods are random and unbiased?
1. Simple Sample
2. Systematic Sample
Why do need a key when creating a double-sided stem and leaf plot?
So that the readers of the stem and leaf plot understand what the stem and leaf values represent
What is the median of the data set: 9, 24, 10, 12, 25, 13, 15, 13, 15, 13, 16, 16, 18, 22, 23, 24
Veterinary doctors marked 30 deer and released them. Later on, they counted 150 deer, 12 of which had marks. To the nearest whole number, what is the best estimate for the deer population?
375 deers
Find the difference in the MAD for each data set:
A) 2,4,6,8
B) 15, 17, 19, 21
0
If a research wants to know how many pets the students at WFIS have and decides to ask every 13th student in the school, what type of sampling method is being used?
Systematic Sample
If the mean of a data set is 79.5, and the data set is as follows: 75, 77, 81, x
What is the value of x?
85
Find the difference in the means (round each one to the nearest whole number) between the following two data sets.
A) 7, 4, 3, 7, 1, 9, 8
B) 0, 1, 2, 3, 4, 6, 9
2
If 60 out of 200 students like soccer, and you want to predict how many out of 500 would like soccer?
150 out of 500 would like soccer
Find the product in the MAD for each data set:
A) 2, 5, 8, 12
B) 2, 3, 4, 6
*DO NOT ROUND YOUR ANSWER
4.0625
Is a random sampling method more or less likely to create results that accurately represent the population?
More likely
What are the three criteria a question must meet in order to be considered a statistical question?
1. It has to have a specific/target population
2. It has to be interesting
3. It has to give you a range of answers (5-25) and cannot be yes/no or single answer \questions
Find the sum of the medians for both sets of data:
A) 0, 1, 2, 3, 4, 6, 9
B) 3, 7, 2, 5, 2, 5
7
Approximately 1,921 people
Find the MAD for each data set and then find the quotient (hint: enter the biggest MAD in the calculator first)
A) 9, 12, 22, 24
B) 12, 24, 28, 30
*round your solution to the nearest tenth
1.1
What is the difference between a population and a sample?
A population is the entire group that a study aims to understand, while a sample is a smaller, manageable subset of that population that is actually studied to make inferences about the whole group.
What is the 3rd quartile in a box and whisker plot for the data set: 22, 23, 25, 26, 27
26.5