chapter 3 : estimating a parameter

Question 1

point estimate

Answer 1

single guess for the population value. It truly respect population just when the sample is an unbiased estimator of population value

Question 2

interval estimate

Answer 2

range of all plausible population value

Question 3

confidence level

Answer 3

probability that a sample falls within interval

Question 4

precision

Answer 4

width of confidence level, the arrow shows it –> the shorter means the more precise

Question 5

standard error

Answer 5

standard deviation of the sampling distribution. The bigger the sample, the smaller the standard error –> bigger standard error means that the scores are more far away from the mean

Question 6

critical value

Answer 6

value of a theoretical probability distribution that separetes top or bottom values, usually top or bottom 25%. usually also 1.96 when standardized values

Question 7

confidence interval

Answer 7

all plausible population values given the sample that we drawn. The bigger the sample, the smaller interval estimates