Hypothesis testing: calculations

Question 1

describe one sample t test

Answer 1

data is continuous and normally distributed

but looks at only one sample

Question 2

describe two sample, independent t test assumptions

Answer 2

data is continuous and normally distributed

the two samples are independent.

Question 3

describe two sample, paired t test

Answer 3

as above but samples are PAIRED (ie matched or use self as a baseline) - not independent

Question 4

t multiplier: is it always 1.96

Answer 4

NO - this is only for infinity degrees of freedom

need to apply p = 0.05 and the degrees of freedom to get it

Question 5

do we use single or double tailed hypothesis

Answer 5

double

Question 6

when we get the confidence interval and p value, what are we actually evaluating?

what values would validate this

Answer 6

the MEAN DIFFERENCE between groups.

validated if
-p < 0.05
CI doesnt include 0 (no diff)

Question 7

what additional factor to consider for independent 2 sample t test

Answer 7

equality of variance

Question 8

formula and interpretation

Answer 8

large SD ^ 2 / small SD ^ 2

if over 2, unequal variance/SD
if less than 2, equal variance/SD