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25 Questions mixed types from a STAT class


A sample of 20 observations has a standard deviation of 4. The sum of the squared deviations from the sample mean is:


What type of probability uses sample spaces to determine the numerical probability that an event will occur?




If A and B are any two events with P(A) = .8 and P(B|A) = .4, then the joint probability of A and B is





Find the variance of the following probability distribution.















Which term is NOT synonymous with the expected value of a discrete probability distribution?








If a student randomly guesses at 20 multiple-choice questions, find the probability that the student gets exactly four correct. Each question has four possible choices.


The continuous distribution characterized by a symmetric, bell-shaped curve is the:

























The standard deviation of a probability distribution must be:
































The mean of a probability distribution can be:





























































The standard deviation of f$ ar{X},f$ is usually called the























































































































The theorem that states that the sampling distribution of the sample mean is approximately normal when the sample size n is reasonably large is known as the:











































































































































































































































The standard normal distribution has a mean of ___ and standard deviation of ___, respectively.


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