statistical tests

Question 1

chi- squared
if X2 exceeds critical value

Answer 1

• critical value from table = _____
• null hypothesis rejected
• X2> critical value of ___ there is a significant difference at 0.05 probability
• deviation NOT due to chance

Question 2

chi squared
if X2 less than critical value

Answer 2

• critical value from table= _____
• null hypothesis accepted
• because X2 < critical value of ____ there is NO sig diff at 0.05 probability and ____ degrees of freedom
• deviation likely to be due to chance

Question 3

chi squared
degrees of freedom

Answer 3

n-1

Question 4

standard deviation (students t test)

Answer 4

measures spread of data about the mean
larger the standard deviation the less reliable the mean

Question 5

students t test: what is it for?
chi squared: what’s it for?

Answer 5

• if there is a statistically significant difference between two sets of continuous data
• is there is a significant difference between observed and expected results

Question 6

student t test
degrees of freedom

Answer 6

(n1 + n2) - 2

Question 7

students t test
if t is greater than critical value:
and vice versa

Answer 7

• critical value from table= _____
• null hypothesis rejected
• cuz calculated t value> critical value there is a significant difference at 0.05 probability and ______ degrees of freedom
• there is a significant difference between two data sets