Mid-Chapter 12 Test

Researchers give one group a new cold medicine and compare them to a group that takes no medicine. What is the group that is not given any medicine?

• the control group in an experiment

• the treated group in a survey study

• the treated group in an experiment

• the control group in an observational study

A study compares the grades of student athletes with the grades of students who are not involved in athletics. What are the student athletes?

• the control group in an experiment

• the treated group in an observational study

• the treated group in a survey

• the control group in an observational study

Which of the following best describes a study comparing the weight of free–range chickens with the weight of caged chickens.

• an experiment

• a null hypothesis

• an observational study

• a survey

A study with a sample that is very different from the population is

• an experiment

• an observational study

• unbiased

• biased

Two letters are selected at random from the word "space". What is the probability of selecting 2 vowels?

A die is rolled. Find P(1 or 5).

State which measure of central tendency best represents the data.

12, 16, 14, 17, 13, 15, 0, 18

• Median
• Mean

• Mode

• Standard Deviation

A stained glass window has 25 blue pieces and 20 red pieces. If 2 pieces are selected at random, what is P(2 red or 2 blue)? Give your answer as a simplified fraction.

Mathematical Equivalence

ON

Consider a bag that contains 4 green marbles, 3 white marbles, 1 orange marble, and 2 pink marbles. If 2 marbles are selected in succession with replacement, what is the probability that the marbles are both green? Give your answer as a decimal rounded to the nearest 100th.

Mathematical Equivalence

ON

Consider a bag that contains 4 green marbles, 3 white marbles, 1 orange marble, and 2 pink marbles.

If 2 marbles are selected in succession with replacement, what is the probability that one is white and one is orange?

Give your answer as a decimal rounded to the nearest 100th.

Mathematical Equivalence

ON