Statistics

Question 1

When would you use correlation coefficient?

Answer 1

When looking for an association/correlation between variables.

Question 2

When would you use the chi-squared test?

Answer 2

When comparing frequencies.

Question 3

When would you use students t-test?

Answer 3

When comparing mean values between 2 groups.

Question 4

Why is a statistical test necessary for analysing the results of the investigation?

Answer 4

1. enables null hypothesis to be accepted or rejected
2. determines whether the correlation or difference is significant
3. determines the probability of the difference or correlation being due to chance.

Question 5

What can you conclude if the calculated value is greater than or equal to the critical?

Answer 5

-Reject the null hypothesis
-There is a significant difference or correlation
-The probability of the difference/correlation being due to chance is less than 5% (0.05)

Question 6

What can you conclude if the calculated value is lower than the critical?

Answer 6

-Accept the null hypothesis
-There is no significant difference or correlation
-The probability of the difference being due to chance is more than 5% (0.05).

Question 7

What does P=0.05 mean?

Answer 7

The probability that the results are due to chance is 5%

Question 8

What does P<0.05 mean?

Answer 8

The probability that the results are due to chance is less than 5%

Question 9

What does P>0.05 mean?

Answer 9

The probability that the results are due to chance is greater than 5%.