Student's t-Test

Question 1

What is the student’s t-Test?

Answer 1

it is used to compare two sets of data to see if they are significantly different

Question 2

Step 1 - What do you calculate first?

Answer 2

calculate the difference between the means of both data sets (x-bar 1 - x-bar 2)

Question 3

Step 2 - What do you square?

Answer 3

the standard deviation of each group (S^2)

Question 4

Step 3 - What do you divide S^2 by?

Answer 4

its sample size

Question 5

Step 4 - What do you add?

Answer 5

add both group values together (S1 squared / Nv1) + (S2 squared / Nv2)

Question 6

Step 5 - What do you square root?

Answer 6

the previous answer from step 4

Question 7

Step 7 - What do you ignore?

Answer 7

ignore the negative values - the answer doesn’t change even if it’s negative

Question 8

Step 6 - What do you divide?

Answer 8

divide the difference between the means (x-bar 1 - x-bar 2) by the square rooted answer = t value

Question 9

What is null hypothesis?

Answer 9

there is no significant difference between the means of both samples

Question 10

What is critical value at p=0.05?

Answer 10

If the t-test statistic is greater than the critical value at P = 0.05, then you reject the null hypothesis → there’s less than 5% probability that the results occurred by chance.

Question 11

What is degree of freedom (df/DF)?

Answer 11

(Sample size of group 1 + Sample size of group 2 - 2