Distributions Statistics

Which of the following is true about geometric distributions?

• Geometric distributions are approximately skewed right.

• Geometric distributions are approximately symmetric.

• Geometric distributions are approximately skewed left.

• The shape could be symmetric or skewed.

The American Red Cross says that about 11% of the U.S. population has Type B blood. A blood drive is being held at your school. What is the probability that at least 2 of the first 10 blood donors has Type B blood? 

• 0.088

• 0.697

• 0.214

• 0.303 

The American Red Cross says that about 11% of the U.S. population has Type B blood. A blood drive is being held at your school.What is the probability that exactly 2 of the first 20 blood donors have Type B blood? 

• 0.316

• 0.282

• 0.001

• Not here

The American Red Cross says that about 11% of the U.S. population has Type B blood. A blood drive is being held at your school. What is the probability that the tenth blood donor is the first donor with Type B blood?

• approximately 0.00

• 0.316

• 0.0385 

• 0.279

Which one of these variables is a continuous random variable?

• The time it takes a randomly selected student to complete an exam.

• The number of tattoos a randomly selected person has.

• The number of women taller than 68 inches in a random sample of 5 women. 

• The number of correct guesses on a multiple choice test. 

• Not a binomial experiment
• Yes. n = 8
  p = .85 
  q = .15
   x = 0, 1, 2, 3, 4, 5, 6, 7, 8
• Yes. n = 8
  p = .15 
  q = .85
   x = 0, 1, 2, 3, 4, 5, 6, 7, 8
• Yes. n = 8
  p = .85 
  q = .15
   x = 8

A test consists of 10 multiple choice questions with five choices for each question.  As an experiment, you GUESS on each and every answer without even reading the questions. 
What is the probability of getting exactly 6 questions correct on this test?

• 0.6%

• 0.00001%

• 0.0064%

• 0.0002%

• Discrete
• Continuous

If the probability that a house in your neighborhood has a dog is 60%, what is the chance that you find a house with a dog before the fifth house?

• 0.97

• 0.99

• 0.02

• 0.04

What is a distribution of a set of data?

• How you collected your data

• How the data was distributed to the statisticians

• A description of the most common data values

• Where the values are on a number line and how often each occurs