Lesson 23 Study Guide

​Lesson 23 Study Guide

Show ALL of your work on your study guide paper.

Open Ended

Emma has three random samples of the same size from a population of 650 people. In one sample, 78% of people have brown eyes.  In another, 85% have brown eyes. In the third, 83% have brown eyes. About how many people with brown eyes should she expect are in the population? Show your work.

Open Ended

A school has 800 students.  The principal plans to order a tote bag for each student. They ask 120 students selected at random which color bag the student prefers.  Based on this sample, how many bags of each color should the principal order?

Open Ended

A box contains a mix of 800 golf balls.  Some are white and the rest are purple.  Each student in Mrs. Ramirez's class selects a random sample of 20 golf balls from the box, counts the purple golf balls, and returns the sample to the box.  What is a reasonable estimate for the number of purple golf balls in the box? Show your work.

Multiple Select

Aniyah studies the fish populations in a lake. She catches fish, tags them, identifies the type, and returns them to the lake. She takes two random samples in the winter and two in the summer. She organizes her data in the table at the right. Which inferences about the fish populations in the lake are reasonable?
Select all the correct answers.

• The total number of fish in the lake is 600.

• The walleye population comprises anywhere from 12% to 14% of the total population in both the winter and summer.

• The number of whitefish in the lake is greater than the number of trout.

• The ratios of the populations of trout, whitefish, and walleye are relatively stable from the winter to the summer.

• The populations of trout, whitefish, and walleye are approximately twice as large in the summer as in the winter.