STATISTICS AND PROBABILITY

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

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

• 0

• 1

• 2

• 3

Which of the following is not a true statement?

• 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 one.

If P(X) = X/6, what are the possible values of X for it to be a probability distribution?

• 0, 2, 3

• 1, 2 ,3

• 2, 3, 4

• 1, 1, 2

Identify the whether the given variable is discrete or continuous.

-> the number of books in the library

• discrete

• continuous

Identify the whether the given variable is discrete or continuous.

-> the lifetime in hours of 15 flashlights

• discrete

• continuous

Identify the whether the given variable is discrete or continuous.

-> the capacity of water dams in a region

• discrete

• continuous

Identify the whether the given variable is discrete or continuous.

-> the number of tourists each day in museum

• discrete

• continuous

Identify the whether the given variable is discrete or continuous.

-> the weight of Grade 1 pupils

• discrete

• continuous

What do you call processes involved in making conclusions about population?

• Estimating parameters

• Hypothesis testing

• Inferential statistics

• Descriptive statistics