Relative Frequency day 1.notebook
April 04, 2017
Do Now:
For each data set listed, state the type of data set it is (numerical or categorical).
1) 12 ft, 6 ft, 8 ft, 22 ft _______________________________
2) male, female, male, male ____________________________
3) orange, red, green, blue _____________________________
Vocabulary
Relative Frequency: the frequency of a particular category divided by the sum of all the frequencies. It is expressed as a percent or decimal.
Relative Frequency day 1.notebook
April 04, 2017
Example – Converting to a Relative Frequency Table
The results of a poll of 100 adults about their favorite sport are shown in the two – way table below. Some information is missing in the table.
Find the relative frequencies.
What percentage of the people chose golf?
Consider the Rufus King data from the previous lesson regarding after school activities:
Calculate the relative frequencies for each of the cells.
1. If a student were randomly selected from the students at the school, do you think the student selected would be a male or a female?
2. If a student were selected at random from school, do you think this student would student would be involved in an after‐school program? Explain your answer.
2. If a student were selected at random from school, do you think this be involved in an after‐school program? Explain your answer.
3. Why might females think they are more involved in after‐school activities than males? Explain your answer.
Relative Frequency day 1.notebook
April 04, 2017
choose if given the opportunity. The results of a poll of 450 students about the super power they would Super
To Fly
Freeze Time Invisibility
49
60
48
1
70
51
71
27
25
48
222
100
131
75
26
118
450
Strength
Telepathy
Total
Females
Males
Total
Calculate the relative frequencies for each of the cells.
1. Based on previous work with frequency tables, which cells in this table would represent the joint relative frequencies? Which cells in the relative frequency table would represent the marginal relative frequencies?
2. What is the joint relative frequency for females and “invisibility”? Interpret the meaning of this value.
3. What is the marginal relative frequency for “freeze time”? Interpret the meaning of this value. To Fly
Females
Males
Total
Freeze Time Invisibility
Super
Strength
Telepathy
Total
Relative Frequency day 1.notebook
April 04, 2017
HW: Worksheet