Midterm 1 review

Choose from below the type of sampling method used in this study. You have 1000 students and you want a sample of 100. You randomly select a starting point between 1 and 10 and then choose every 10th student thereafter.

• Two-stage cluster sampling

• Systematic sampling

• Stratified random sampling

• One-stage cluster sampling

What type of probability experiment involves a fixed number of independent trials, each with only two possible outcomes (success or failure), and a constant probability of success on each trial?

• Binomial experiment

• Normal experiment

• Gaussian experiment

• Quasi-experiment

Which of the following are true?

• The first quartile of class A is higher than class B

• 75% of the values in class A are above 82.

• The second quartile of class B is higher than class A.

• 50% of the values in class B are above 73.

Which of the following is TRUE regarding these density curves?

• σ_A < σ_B

• μ_{A =} μ_B

• μ_{A >} μ_B

1.     The statement Pr(A or B) happening = Pr(A) + Pr(B) is true only when

• A and B are independent.

• A and B are mutually exclusive.

• A and B are dependent on each other.

Solve the following problem: The following shows the probability of trees being above or below a particular height. What is the probability of randomly choosing two trees and having one that is taller than 10 meters AND another shorter than 10 meters?

P(Height < 3) = 0.01

P(10 > Height > 3) = 0.34

P(Height > 10) = 0.65

• 0.3

• 0.228

• 0.455

• 1

What type of variable is this?

Number of hospital visits for patients: 1, 2, 2, 2, 4, 5, 6, 6, 10 ...

• Discrete

• Continuous

• Nominal

• Ordinal

Solve this summation equation.

• 47

• 55

• 50

• 60

Which of the following describes the spread of the data?

• μ

• 1. σ

• n

• ∑