Stats

Question 1

How to decide how to use chi-squared

Answer 1

Data collected must be frequencies, how many individuals are in a category
Wanting to find out a difference between two opposing data sets

Question 2

How to write a null hypothesis

Answer 2

Start- there is no significant difference between…. (Two samples)
There is no correlation between…. (two co variables)

Question 3

How to calculate the degrees of freedom for chi squared

Answer 3

Number of categories-1

Question 4

What does p is less than or equal to 0.05 mean

Answer 4

There is a 5% probability that the difference in results are due to chance this is significant so null hypothesis is rejected

If difference is over 5%, not significant, null hypothesis isn’t rejected

Question 5

How to decide when to use student t test

Answer 5

Continuous data is used
The difference between two means is investigated

Question 6

What’s a unpaired t test

Answer 6

Compares the mean of two independent/unrelated groups

Question 7

What’s a paired t test

Answer 7

Compared the mean of two related groups from the same individual, results are paired, north groups have same sample size

Question 8

How to calculate degrees of freedom for an impaired t test

Answer 8

n1 + n2 -2
n1, number of samples in first data set
n2, number of samples in second data set

Question 9

How to find degrees of freedom in a paired t test

Answer 9

n-1

Question 10

How to know when to use correlation coefficient

Answer 10

Continuous data
Looking for a trend between two measurements in the sample

Question 11

How to calculate difference in freedom for correlation coefficient

Answer 11

Count the number of shared pairs