the tests: aim, assumption & null hypothesis

Question 1

One sample t-test

Answer 1

-Compares means and population mean- c ( a constant)
-assumes normality
-accept H0: mean =population mean, c

Question 2

paired t test

Answer 2

-parametric
-compares mean of 2 related sample
-assumes normality of mean difference, normality of distribution,
-accept H0 if means are equals and mean difference is 0

Question 3

2 sample t-test/ independent t-test

Answer 3

-parametric
-compares means of 2 independent samples
-from normal distribution assumes variances are equal & mean difference is 0
-acept H0 if means are equal
-df : n + m - 2

Question 4

F-test

Answer 4

-compares variances of 2 independant samples
-assumes normal distribution
-accept H0 if variances1 = variance2
-df : n-1/ d-1

Question 5

One-way ANOVA test

Answer 5

-compares means of multiple independent samples
-from normal distribution , variances are equal
-accept H0 if : all means are equal
-reject H0 if even 1 mean is different

Question 6

Chi-square test

Answer 6

-compares distribution of categorical variables
-assumes that for at least 20% all expected frequencies are below 5
-accept H0 : 2 variables are independent

Question 7

Non-parametric test

Answer 7

-compares sample: where normality does not hold & data are measure on ordinal scale
-assumes continuous distribution
-accept H0: same population

Question 8

Cohen’s Kappa/ Measurement of agreement

Answer 8

-measures agreement between 2 categorical variables
-accept H0 : Kpop=0

Question 9

OR

Answer 9

-aims to find relative risk factor
-assumes retrospective study
-accept H0: OR= 1

Question 10

RR

Answer 10

-finding risk factor
-assumes cohort study
-H0 accept: RR=1

Question 11

binomial test

Answer 11

-compares unknown probability
-accept H0 if values is betwen -1.96 & 1.96

Question 12

survival analysis

Answer 12

-calculates survival probability, mean survival and median survival
-assumes censored dat