Chapter 8

Question 1

Point estimate

Answer 1

the value of that statistic from a sample, our “best guess” at the value of an unknown parameter

Question 2

Confidence interval

Answer 2

estimate plus or minus the margin of error

Question 3

Margin of error

Answer 3

Tells how close the estimate tends to be to the unknown parameter in repeated random sampling

Question 4

Confidence level C

Answer 4

Gives the overall success rate of the method for calculating the confidence interval, C% of all possible samples, the method would yikes an interval that captures the true parameter value

Question 5

Random

Answer 5

Data comes from a well-designed random sample or randomized experiment

Question 6

Normal

Answer 6

The sampling distribution of the statistic is approximately normal

Question 7

Independent

Answer 7

Individual observations are independent. When sampling without replacement, the sample size n should be no more than 10% of the population size N (10% condition) to use our formula for the standard deviation of the statistic

Question 8

Point estimator

Answer 8

a statistic that provides an estimate of a population parameter

Question 9

Standard error of the sample mean

Answer 9

Describes how far x bar (mean) will be from u, on average, in repeated SRS’s of size n

Question 10

Robust procedures

Answer 10

If the probability calculations involved in that procedure remain fairly accurate when a condition for using the procedure is violated