psych 311 exam 2 t/f questions

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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


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