Statistical Inference

Question 1

statistical inference

Answer 1

deduce broad conclusions about the population from which a sample has been obtained

Question 2

point interval

Answer 2

derived from the corresponding sample parameters e.g. the mean and the standard deviation

Question 3

confidence interval

Answer 3

range which we would expect, with a given level of confidence to include the population parameter

Question 4

inferences about sample means are based on normal distribution if:

Answer 4

• sample has been selected from a normal population, with a known SD or the sample size is large
• observations in the sample are independent i.e. sample is random and no member is included more than once

Question 5

as the number in the sample increases…

Answer 5

the distribution of the sample proportion tends to normality

Question 6

type I error

Answer 6

reject a true null hypothesis (i.e. you think there is a significant relationship when there is not)

Question 7

type II error

Answer 7

accept a false null hypothesis (i.e. you think there isn’t a relationship, when in fact there is)

Question 8

test statistic

Answer 8

to test the difference between the observed and hypothesised