Frequency, relative frequency, percents and proportions

​ (a)   is the number of times that something occurs.

• Frequency
• Relative Frequency
• Percentage

​ (a)   tells us the number of times something occurs compared to the ​ (b)  

• Relative Frequency
• total
• Frequency
• percentage
• column
• row

To calculate the relative frequency, what ratio do you set up?

How do you convert a ratio into a percentage?

Erika wanted to see if there was a relationship between how often someone eats fast food in a week and how the person gets to work each day. She conducted a survey where participants answered how often they eat fast food as well as whether they drive to work or use public transportation.

Erika wants to know the relative frequency of participants who eat fast food 3 or more times a week. Which ratio should she use to calculate her percentage?

Erika wanted to see if there was a relationship between how often someone eats fast food in a week and how the person gets to work each day. She conducted a survey where participants answered how often they eat fast food as well as whether they drive to work or use public transportation.

What is the relative frequency of participants who drive to work?

• 87%

• 50%

• 61%

• 55%

Erika wanted to see if there was a relationship between how often someone eats fast food in a week and how the person gets to work each day. She conducted a survey where participants answered how often they eat fast food as well as whether they drive to work or use public transportation.

Of the people who drive to work, find the relative frequency of those who eat fast food 0-2 times/week

• 8%

• 40%

• 71%

• 34%

Erika wanted to see if there was a relationship between how often someone eats fast food in a week and how the person gets to work each day. She conducted a survey where participants answered how often they eat fast food as well as whether they drive to work or use public transportation.

Of the people who drive to work, find the relative frequency of those who eat fast food 3 or more times/week

• 66%

• 23%

• 34%

• 78%

Erika wanted to see if there was a relationship between how often someone eats fast food in a week and how the person gets to work each day. She conducted a survey where participants answered how often they eat fast food as well as whether they drive to work or use public transportation.

Of the people who use public transportation, find the relative frequency of those who eat fast food 0-2 times per week

• 100%

• 47%

• 63%

• 37%

Erika wanted to see if there was a relationship between how often someone eats fast food in a week and how the person gets to work each day. She conducted a survey where participants answered how often they eat fast food as well as whether they drive to work or use public transportation.

Of the people who use public transportation, find the relative frequency of those who eat fast food 3 or more times per week

• 0%

• 75%

• 63%

• 37%