Statistics test

Question 1

Population parameter

Answer 1

Describing the whole population

Question 2

Statistic

Answer 2

From a sample

Question 3

Standard deviation

Answer 3

Uses mean or proportion from population

Question 4

Standard error

Answer 4

Uses sample mean or proportion

Question 5

When to use T* vs Z* values

Answer 5

Use t* values (confidence level + dF) for means while use z* values (probability) for proportions

Question 6

Sampling distribution of sample statistic

Answer 6

Distribution of sample means or proportions is normal-shaped even if the population itself isn’t normal. Described by the central limit theorem.

Question 7

Confidence Interval (CI)

Answer 7

Statistic +- (multiplier)(standard error)

Question 8

Margin of error

Answer 8

(multiplier)(standard error)

Question 9

Conservative margin of error

Answer 9

Using 0.5 as p value

Question 10

Test statistic

Answer 10

(Sample statistic - null)/(standard error)

Question 11

Standard error for two props

Answer 11

Combined proportion

Question 12

Type I error

Answer 12

Reject H0 when it is actually true (Lower confidence level/higher alpha)

Question 13

Type II error

Answer 13

Fail to reject H0 when its actually false (Higher confidence level/lower alpha)