Chapter 6 Quiz Review

The animal colony in the psychology department contains 20 male rats and 30 female rats. Of the 20 males, 15 are white and 5 are spotted. Of the 30 females, 15 are white and 15 are spotted. Suppose that you randomly select 1 rat form this colony. What is the probability of obtaining a white male?

• p = 0.75

• p = 0.60

• p = 0.30

• p = 0.50

A jar contains 10 red marbles and 30 blue marbles. If you randomly select 1 marble from the jar, what is the probability of obtaining a red marble?

• p = 0.30

• p = 0.25

• p = 0.33

• p = 0.20

Tags

CCSS.7.SP.C.7B

• p = 0.3085

• p = 0.6687

• p = 0.4104

• p = 0.3354

Tags

CCSS.HSS.ID.A.4

1. What column would we use for finding a proportion that covers over .50 of our normal curve? 

• B (Body)

• C (Tail)

• D (Between the Mean and z)

• None of the above

Answer explanation

The B (Body) column should be used for finding proportions that exceed half of the distribution given.

Tags

CCSS.HSS.ID.A.4

What are the two necessary conditions needed for probability?

• Clustered Sampling and Stratified Sampling

• Random selection and random assignment

• Systematic Sampling and Random assignment

• Random sampling and Sampling with Replacement

Tags

CCSS.HSS.IC.B.3

What is the probability of selecting a score greater than 45 from a positively skewed distribution with μ = 40 and σ = 10?

• p = 0.3085

• p = 0.6915

• N/A

• p = 0.1915

Answer explanation

You cannot obtain the answer. The unit normal table cannot be used to answer this question because the distribution is not normal.

Tags

CCSS.HSS.ID.A.4

1. We can take X-scores and convert them directly into proportions. 

• True

• False

Tags

CCSS.HSS.ID.A.4

Find the proportion of the normal distribution that is associated with z > -0.50

• p = 0.6915

• p = 0.3085

• p = 0.1915

• p = 0.6950

Answer explanation

Drawing a distribution, you will notice that the proportion of the distribution that is greater than z = -0.50 exceeds .50, meaning we will find our answer in the B (Body) column of our unit normal table. Afer matching our z = -0.50 to the B column, we should get a proportion of p = 0.6915.

Tags

CCSS.HSS.ID.A.4

1. What is the greatest proportion amount that could be held within the tail region?

• 0.50

• 0.48

• 0.33

• 0.51

Tags

CCSS.7.SP.C.7B

1. What does an italicized p stand for? 

• Probability

• Potentiality

• Paul

• Practicality

Tags

CCSS.RI.11-12.7

CCSS.RI.9-10.7

CCSS.RL.11-12.7

CCSS.RL.8.7

CCSS.RL.9-10.7