Lecture 25- HT diff means/prop

Question 1

If the T statistic is away from the center of the distribution what are the two possibilities?

Answer 1

• H naught is true its just a very rare statistic

- H naught is not true the test statistic follows a different distribution (alternative hypothesis)

Question 2

What is an unpaired data?

Answer 2

Means that the data is not matched specifically there is just random selection for each group

Question 3

Do the example question on slide 469

Answer 3

Working in slides

Question 4

Do the example question on slide 476…

Answer 4

Working on slides

Question 5

Do the example question on slide 482…

Answer 5

Working on slide

Question 6

What’s a 2 sided hypothesis, how is it different to a 1 sided hypothesis?

Answer 6

• 2 sided is what have been currently doing. It’s where you consider differences from the null in either direction.
• 1 sided hypothesis tests is where we focus on either entirely positive or entirely negative changes from the null (how to do them is not covered in STAT110).

Question 7

True or false: Hypothesis can never be written in terms of sample quantities?

Answer 7

True: hypothesis by nature are at the population level.

Question 8

How do you use lose information when we perform a formal hypothesis test and only include the alpha value?

Answer 8

Miss P which quantifies the difference