Medium Level 2

Question 1

Geometric setting and random variable

Answer 1

Each trial success probability must be the same

X = number of trials needed to achieve one success

Question 2

Why use a control group

Answer 2

A control group gives researchers a comparison group to be used to evaluate the effectiveness of the treatments

It allows the researchers to measure the effect of all the treatment compared to none at all

Question 3

The standard normal distribution

Answer 3

The normal distribution with

- mean = 0 and the standard deviation =0

Question 4

SRS

Answer 4

An SRS is a sample taken in such a way that every set of n individuals has an equal chance to be the sample actually selected

Question 5

Complementary events

Answer 5

Two mutually exclusive events whose union is the sample space

• rain/ no rain
• draw at least one heart/ draw NO hearts

Question 6

Type 1 error
And
Type 2 error

Answer 6

Type one: finding convincing evidence that the Ha is true when in reality it is NOT

Type two: not finding convincing evidence that the Ha is true when it actually IS true