Hypothesis Testing

Question 1

How is hypothesis testing conducted

Answer 1

First, create a default, null hypothesis, and then you create an alternative hypothesis and see if the evidence contradicts the null hypothesis

Question 2

Is the null hypothesis ever approved based on sample evidence

Answer 2

No only not rejected, it is like a test against a particular illness

Question 3

If the null hypothesis is rejected what commonly ocurrs

Answer 3

Some action is taken and a new status is estabished

Question 4

What is a one tailed and two tailed hypothesis test

Answer 4

If it is one tailed we can only reject the null hypothesis in one side of the hypothesized value. If it has two tails we can reject it on both sides of the tested value

Question 5

What is a type I error

Answer 5

False negative

Question 6

What us a type II error

Answer 6

False positive

Question 7

How do you decrease the likelihood for a type I error without increasing the likelihood for type II errors

Answer 7

Increasing the test sample

Question 8

What is the p value

Answer 8

The likelihood of finding a sample mean at least as extreme as the current one. It is the observed probability of a type I error

Question 9

How does the four step process go in hypothesis testing

Answer 9

Establish a null and an alternative hypothesis, specify the significance level which is the allowed probability of making a type 1 error, calculate the value of the test statistic and lastly state the conclusion and interpret the results. If p value is smaller than a the null hypothesis is rejected