vocabulary
What is a two-way table?
A table that organizes data by showing the relationship between two categorical variables.
A survey found that 80 students play a sport. Of those students, 45 are boys. How many girls play a sport?
35 girls
A row contains the values 18 and 27. What is the row total?
45
Out of 80 students surveyed, 32 are boys. What is the relative frequency of boys?
40%
A survey of 150 students found that 90 play a sport. If 55 of the students who play a sport are girls, how many boys play a sport?
35
What is a frequency?
The number of times a particular outcome or category occurs.
A survey includes 120 students. Sixty-five are girls. If 40 girls own a pet, how many girls do not own a pet?
25 do not own a pet
A column contains the values 34 and 46. What is the column total?
80
Out of 120 students surveyed, 54 play a sport. What is the relative frequency of students who play a sport?
45%
A survey found that 120 students own a pet. If 45 of the pet owners are boys and there are 70 boys total, how many boys do not own a pet?
25
What is a cell?
The box where a row and a column intersect in a two-way table.
In a survey, 90 students like math. If 35 of those students are boys, what percent of the students who like math are boys?
38.9%
The row totals in a two-way table are 52 and 78. What is the grand total?
130
Out of 150 students surveyed, 45 are girls who own a pet. What is the relative frequency of girls who own a pet?
30%
In a survey of 200 students, 130 like math. Of those students, 75 are girls. If there are 95 girls total, how many girls do not like math?
20
What are marginal totals?
The totals at the ends of rows and columns that show the overall counts for each category.
A survey found that 75 students play sports and 45 do not. Of the students who do not play sports, 30 are girls. What is the probability that a randomly selected student who does not play sports is a girl?
66.7%
One column total is 95 and the other column total is 105. What is the grand total?
200
Of 70 boys surveyed, 49 play a sport. What is the relative frequency of boys who play a sport?
70%
A survey of 180 students found that 108 own a phone. If 60 students who own a phone are boys and there are 82 boys total, what percent of boys own a phone?
73.2
What is relative frequency?
A frequency divided by the total number of observations, often expressed as a decimal, fraction, or percent.
A survey of 200 students found that 120 own a pet. Of the students who own a pet, 70 are girls. There are 95 girls in the survey. How many girls do not own a pet?
25
A two-way table has row totals of 84 and 116. One column total is 97. What is the other column total?
130
Of 90 students who own a pet, 63 also play a sport. What is the relative frequency of pet owners who play a sport?
70%
A survey of 250 students found that 140 play a sport. Of the students who play a sport, 85 are girls. There are 130 girls total. If a student is chosen at random from the girls, what is the probability that she does not play a sport?
34.6