# 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.

 X P(X) 1 0.20 2 0.35 3 0.10 4 0.25 5 0.10

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  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.

rest on attach

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