|Conception of Variables in Biostatistics
by shuvo - 20076 reads, based on 15 votes
Characteristics which show variability or variation are known as variable. eg. Height, WBC count, sex, religion, vomiting episodes etc....
|Biostatistics Online Mock Test 222
by RxPG - 20012 reads, based on 67 votes
Multiple Choice Test
1) Advantages of random sampling for studying the general human population include:
Choose 3 of the following options.
A. it can be applied to any population.
B. likely errors can be estimated.
C. estimates obtained are not biased.
D. it is easy to do.
E. the sample can be referred to a known population.
|Statistics at square one
by RxPG - 8848 reads, based on 3 votes
This free online textbook was written by T D V Swinscow, revised by M J Campbell, University of Southampton. Statistics at Square One is one of the most widely used statistical textbooks in the UK, and the structure and format of the original book has been retained in this online version. ...
|Z-test : A Brief Overview
by - 9855 reads, based on 7 votes
In some situations the sequence of steps used in t-test can be done using z-scores instead of t-scores. Then such a test is called z-test.
Use: z-test is/can be used in place of t-test when
• The population standard deviation is known which allows the standard error, rather than the estimated SE to be found
• The sample is sufficiently large (n > 200) for the SD to provide a reliable estimate of SE....
|All the Biostatistics notes you will need for a quick revision
by willpower - 30511 reads, based on 59 votes
POPULATION: Universe of all units being studied.
If we want to study lung cancer among Indians, then the study population will be all Indians.
If we want to study lung cancer among Indian women, then the population will be all
SAMPLE: Subset of the population
RANDOM SAMPLE: Each member of the population has an EQUAL CHANCE of being chosen for the sample ...