Exam 11: Probability and Statistics

Two psychology majors, in two different sections of Clinical Psychology, were comparing test scores. The following gives the students' scores, class mean, and standard deviation for each section: Section 1 Section 2 Student score 84 75 Mean 75 60 Standard deviation 7 8 -What is the z-score of the student from section 2 and what is the probability that a student in section 2 will score higher than 75?

Jim is considering pursuing an MS in Information Systems degree. He has applied to two different universities. The acceptance rate for applicants with similar qualifications is 20% for University X and 45% for University Y. What is the probability that Jim will be accepted at both universities?

Another name for the mean of a probability distribution is its expected value.

Employees of a local company are classified according to gender and job type. The following table summarizes the number of people in each job category. Administrative (AD) 110 10 Salaried staff (SS) 30 50 Hourly staff (HS) 60 40 If an employee is selected at random, what is the probability that the employee is female given that the employee is a salaried staff member?

Bayesian analysis involves a(n) ________ probability.

Employees of a local company are classified according to gender and job type. The following table summarizes the number of people in each job category. Administrative (AD) 110 10 Salaried staff (SS) 30 50 Hourly staff (HS) 60 40 -If an employee is selected at random, what is the probability that the employee is female or works as a member of the administration

Under the normal curve, the area between z = 1 and z = -2 includes approximately ________ of the values.

A marginal probability is the probability of a single event occurring.

The owner of a seafood market determined that the average weight for a crab is 1.6 pounds with a standard deviation of 0.4 pound. Assuming the weights of the crabs are normally distributed, what is the probability that a randomly selected crab will weigh more than 2.2 pounds?

For some value of Z, the probability that a standard normal variable is below Z is 0.3783. The value of Z is:

In a binomial distribution, for each of n trials, the event

Assume X has the following probability distribution : X 1 2 3 4 P(X) .1 .5 .2 .2 Compute the standard deviation of X.

The variance of a random variable is computed by multiplying each possible value of the variable by its probability and summing these products.

Mutually exclusive events are

A set of events is collectively exhaustive when it includes all the events that can occur in an experiment.

The expected value of the standard normal distribution is equal to ________.

An online sweepstakes has the following payoffs and probabilities. Each person is limited to one entry. Payoff Probability \ 1.00 0.1000 \ 5.00 0.0100 \ 10.00 0.0050 \ 100.00 0.0010 \ 1,000.00 0.0005 \ 5,000.00 0.0001 -The probability that someone wins any money is ________.

The weight of a jar of jelly is normally distributed with a mean of 16 oz and a standard deviation of 0.02 oz. What is the probability that a jar of jelly contains less than 16 oz?

A frequency distribution is an organization of ________ data about the events in an experiment.

A ________ probability is the probability that an event will occur given that another event has already occurred.