Math statistical tests

Question 1

What are ways of calculating the average?

Answer 1

Mean, median and mode

Question 2

What is the mean?

Answer 2

The average of all numbers

Question 3

How do you calculate the mean?

Answer 3

Add up all numbers and divide by total number of numbers

Question 4

What is the median?

Answer 4

The middle value of a list of numbers

Question 5

How do you calculate the median?

Answer 5

List all the numbers in numerical order from smallest to largest

Question 6

What is the mode?

Answer 6

The value that occurs the most often

Question 7

What is standard deviation?

Answer 7

A measure of how spread out the data is and how this relates to the mean

Question 8

What percentage of data is within 1 standard deviation?

Answer 8

68%

Question 9

What percentage of data is within 2 standard deviations of the mean?

Answer 9

95%

Question 10

What percentage of data is within 3 standard deviations from the mean?

Answer 10

99.7%

Question 11

What are the steps of statistical testing?

Answer 11

1. Decide which statistical test to use on the data
2. Set up a null hypothesis
3. Calculate a value using the formula for the statistical test
4. Choose the probability value to use
5. Compare the calculated value with values on a published value
6. Either accept or reject the null hypothesis
7. State whether results are significantly different and at what probability

Question 12

What do all statistical tests start with?

Answer 12

A null hypothesis

Question 13

What are the 2 types of statistical tests?

Answer 13

Student t-test and spearman’s rank correlation

Question 14

What are the types of student t-test?

Answer 14

Paired or unpaired

Question 15

Where does data for a paired t-test come from?

Answer 15

A measurement from a particular group, and then this is repeated on the same group after the factor has changed

Question 16

What does a paired t-test compare?

Answer 16

The mean of 2 sets of data to see if there has been a significant change

Question 17

Where does data for an unpaired t-test come from?

Answer 17

Two different groups at the same time in different places

Question 18

What does an unpaired t-test compare?

Answer 18

The mean values for 2 sets of data to seee if there is a significant difference between the 2 groups

Question 19

What does data need to be for a t-test?

Answer 19

Normally distributed and sufficient to give a reliable mean

Question 20

When do you accept the null hypothesis in a t-test?

Answer 20

If it is less than the table value