Student's t-Test Flashcards Preview

TT - AS Level Biology - Statistics Skills > Student's t-Test > Flashcards

Flashcards in Student's t-Test Deck (11)
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1
Q

What is the student’s t-Test?

A

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

2
Q

Step 1 - What do you calculate first?

A

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

3
Q

Step 2 - What do you square?

A

the standard deviation of each group (S^2)

4
Q

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

A

its sample size

5
Q

Step 4 - What do you add?

A

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

6
Q

Step 5 - What do you square root?

A

the previous answer from step 4

7
Q

Step 7 - What do you ignore?

A

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

8
Q

Step 6 - What do you divide?

A

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

9
Q

What is null hypothesis?

A

there is no significant difference between the means of both samples

10
Q

What is critical value at p=0.05?

A

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.

11
Q

What is degree of freedom (df/DF)?

A

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