STATS

Question 1

when to used parametric vs non parametric tests

Answer 1

parametric- use if data is normally distributed

non parametric- can be used w non normally distributed data, no limit on small sample size

Question 2

types of parametric tests

Answer 2

• students paired t test
• chi squared test
• pearson’s co efficient of linear correlation

Question 3

types of non parametric tests

Answer 3

• wilcoxons tests
• mann-whitney test
• Fishers test
  -Spearmans rank correlation

Question 4

proportion of true positives correctly identified by a test

Answer 4

sensitivity

Question 5

proportion of true negatives correctly identified by a test

Answer 5

specificity

Question 6

Relative risk reduction = (EER - CER) / CER

Answer 6

You are reviewing a study that is comparing a new asthma inhaler against a regular inhaler currently prescribed. The study aims to determine if the new inhaler reduces the number of people having an exacerbation of asthma over a year. The results show 50 patients had an exacerbation out of 100 patients on the regular inhaler and 20 patients had an exacerbation out of 100 patients on the new inhaler.

What is the relative risk reduction in this study?

A== 0.6

Question 7

relative risk ratio = EER / CER

Answer 7

different to relative risk reduction

Question 8

Funnel plot:

Answer 8

visually assess for publication bias in meta-analysis.

Question 9

what chromosome are HLA antigens encoded on?

Answer 9

chromosome 6

Question 10

HLA organ mismatch- rejection==== chromosome 6

Answer 10

chr 6 affected in transplant rejection

Question 11

Specificity = calculation

Answer 11

Specificity = true negatives / (true negatives + false positives)

Question 12

compare survival time = ?

Answer 12

hazard ratio

Question 13

c