Statistics Quiz

Which of the following is a discrete random variable?

• the average amount of electricity consumed

• the number of patients in a hospital

• the amount of paint used in repainting a building

• the average weight of female athletes

Which of the following statements is NOT true?

• The value of a random variable could be zero

• Random variables can only have one value

• The probability of the value of a random variable could be zero

• The sum of all the probabilities in a probability distribution is always equal to 1

Which of the following is TRUE about normal curve distribution?

• Mean=Median=Mode

• Mean>Median>Mode

• Mean<Median<Mode

• Mean<Median>Mode

Which of the following is NOT a characteristic of a normal curve distribution??

• The curve symmetrical about the mean

• The mean, median, and mode are not equal

• The curve extends indefinitely to both sides

• The total area under the normal curve is 100%

It is a table showing all the possible value of a discrete random variable together with their corresponding probabilities?

• Discrete Probability Distribution

• Continuous Probability Distribution

• Probability Standard Distribution

• All of the above

It is a distribution in which the sets of data are clustered at the center and it formed like a bell-shaped curve.

• Discrete Probability Distribution

• Probability Distribution

• Normal Distribution

What is the sum of the area under the Normal Distribution curve?

• 0.997

• 1

• 13.5%

• 0.68

The set of all possible outcomes of an experiment.

• Sample Space

• Variable

• Sample

• Random Variable

If a random variable x is greater than the mean, then which of the following is TRUE about the z-score?

• The z-score is at the left side of the mean.

• The z-score is at the right side of the mean.

• The z-score is the same position as the mean.

• The z-score is either on the left side or on the right side of the mean.

If two coins are tossed, which is not a possible value of the random variable for the number of heads?

• 0

• 1

• 2

• 3