L10 - Goodness of fit tests - Compatibility modes

Question 1

what is a goodness of fit test?

Answer 1

they compare and observed distribution of values to a known distribution of values, in order to infer similarity.

Question 2

what are the Chi- Squared goodness of fit test Assumptions (2)

Answer 2

1. nominal or higher
2. two mutually exclusive categories

Question 3

what is the Chi- squared test equation

Answer 3

x^2 = Σ ((Oi - Ei)^2 / Ei)

Question 4

How do you find the critical value of X

Answer 4

on a Chi-squared table using Degrees of freedom and level of signifcance.

Question 5

what would happen if the calculated value of Chi- squared is greater than the critical value.

Answer 5

you reject the null Hypotheses

Question 6

What do you do if the calculated value of Chi-squared is less than the critical value

Answer 6

You Fail to reject the Null hypotheses

Question 7

what does the Calculated Chi-squared tell us?

Answer 7

its measures the level of difference between the sample statistic and a known value. the greater the difference, the greater the value.