Confidence Intervals (Statistics)

Question 1

Define sampling error

Answer 1

Difference between sample estimate and population parameter

Question 2

Define sample estimate

Answer 2

Estimate of the population parameter

If we repeated sampled from a population, we would get different estimates each time. The bullseye is the population parameter

Question 3

What are confidence intervals?

Answer 3

Measure of uncertainty of a sample estimate

Standard deviation is used to calculate the 95% CI which quantifies uncertainty of a sample estimate to approximate the population parameter

There is a 95% probability that the confidence interval contains the population parameter

Question 4

Bigger sample size = narrower confidence interval

Answer 4

Can be useful in determining the necessary sample size

Question 5

Difference between standard deviation and standard error?

Answer 5

SD - spread of observations

SE -accuracy of sample estimate in population parameter and used to calculate confidence interval