Lesson 12
Larger Populations
Let’s compare larger groups.
Problem 1
Suppose you are interested in learning about how much time seventh grade students at your school spend outdoors on a typical school day.
Select all the samples that are a part of the population you are interested in.
The 20 students in a seventh grade math class.
The first 20 students to arrive at school on a particular day.
The seventh grade students participating in a science fair put on by the four middle schools in a school district.
The 10 seventh graders on the school soccer team.
The students on the school debate team.
Problem 2
For each sample given, list two possible populations they could belong to.
- Sample: The prices for apples at two stores near your house.
- Sample: The days of the week the students in your math class ordered food during the past week.
- Sample: The daily high temperatures for the capital cities of all 50 U.S. states over the past year.
Problem 3
If 6 coins are flipped, find the probability that there is at least 1 heads.
Problem 4
A school's art club holds a bake sale on Fridays to raise money for art supplies. Here are the number of cookies they sold each week in the fall and in the spring:
fall
20
26
25
24
29
20
19
19
24
24
spring
19
27
29
21
25
22
26
21
25
25
- Find the mean number of cookies sold in the fall and in the spring.
- The MAD for the fall data is 2.8 cookies. The MAD for the spring data is 2.6 cookies. Express the difference in means as a multiple of the larger MAD.
- Based on this data, do you think that sales were generally higher in the spring than in the fall?
Problem 5
A school is selling candles for a fundraiser. They keep 40% of the total sales as their commission, and they pay the rest to the candle company.
| price of candle | number of candles sold |
|---|---|
| small candle: $11 | 68 |
| medium candle: $18 | 45 |
| large candle: $25 | 21 |
How much money must the school pay to the candle company?