Which of the following is true about a probability?

• It ranges between -1 and +1
• It ranges between 0 and 100
• It ranges between 0 and +1
• None of the above is true

For two disjoint events, A and B, i.e., they cannot occur at the same time, which of the following is true?

• Pr (A or B) = Pr (A) X Pr (B)
• Pr (A or B) = Pr (A) / Pr (B)
• Pr (A or B) = Pr (A) + Pr (B)
• Pr (A or B) = Pr (A) - Pr (B)

Which of the following is NOT a definition of probability?

• It is the likelihood of an event occurring
• It is measured by the ratio of the event to the total number of possible events
• It is measured by the ratio of the event to the total number of non-events
• All of the above are true

One of the reasons why we can use a one-sample z test for testing means is that the sampling of isdistributed as a Normal distribution.

• True or False?