psych 311 exam 2 t/f questions
T/F The sample mean is an unbiased estimator of the population mean.
true
T/F The sample space is equal to the total number of random outcomes possible for a random variable.
true
T/F The sampling distribution of the mean has minimum variance.
true
T/F A binomial probability distribution is constructed for random variables that have at least two possible outcomes.
false
T/F If a researcher selects a sample of 64 participants from a population with a variance of 16, then the standard error of the mean will be 2.0.
false
T/F In a normal distribution a score of 8 will always be more probable than a score of 0.
false
T/F The central limit theorem states that the sample mean will equal the population mean on average.
false
T/F The probability of an outcome is particularly useful for predicting the likelihood of fixed events.
false
T/F A binomial probability distribution is the distribution of random outcomes for a bivariate or dichotomous random variable.
true
T/F A researcher selects a sample of 625 participants from a population with a mean of 120 and a standard deviation of 25. The probability of selecting a sample mean that is larger than 125 is close to zero.
true
T/F For a set of data with 25±2.5, at least 95% of scores fall between 20 and 30.
true
T/F Probability distributions display the probability of each possible outcome for a given random variable.
true
T/F Probability ranges between 0 and 1 and is never negative.
true
T/F The average sample variance equals the population variance when dividing SS by df.
true
T/F The expected value of a random variable is the mean of a probability distribution.
true
T/F The probability that a participant is married is p(M) = .60. The probability that a participant is married and "in love" is p(M∩L) = .46. Thus, the probability that a participant is in love, given that the participant is married is p = .77.
true
T/F The sampling distribution of the mean is a distribution of all the possible samples of a particular size that can be selected from a given population.
true
T/F The standard error of the mean is the standard deviation in a sampling distribution of sample means.
true
T/F There are 25 possible samples of size 2 that can be selected from a population of 5 people using theoretical sampling.
true
T/F There are more possible samples that can be selected using theoretical sampling than using experimental sampling for any sample size greater than 1.
true
T/F While the expected value of the mean estimates the average outcome, the standard deviation of a probability distribution estimates the distance that all other outcomes deviate from the mean.
true
