# Module 7: Basics Of Biostatistics

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• 1.
1-Risk = new cases/population at risk
• A.

True

• B.

False

• 2.
2- Rate= new cases/ person-time at risk
• A.

True

• B.

False

• 3.
3- odds=cases/non-cases
• A.

True

• B.

False

• 4.
4- Group of patients enrolling for a trial had a normal distribution for weight. The mean weight of the patients was 65 kg. For this group the SD was calculated to be 5 kg.This means that 95.4% of the subjects will weigh between:
• A.

A) 60 and 70 kg

• B.

B) 40 and 90 kg

• C.

C) 50 and 80 kg

• D.

D) 55 and 75 kg

• 5.
5- Percentage may be used to hide the true size of the data in :
• A.

A) large samples

• B.

B) small samples

• C.

C) representative samples

• D.

D) all answers are correct

• 6.
6- Patients in a control group required more Cataract surgery than those in the intervention group ( 15% vs 8%, p = 0.01)
• A.

A) result is statistically significant

• B.

B) result is not statistically significant

• C.

C) the is role for chance in the comparison

• D.

D) no answer is correct

• 7.
7-If all patients are 45 years old, the SD will be :
• A.

A) 45

• B.

B) 45÷2

• C.

C) Zero

• D.

D) 15

• 8.
8-"Standard deviation" means :
• A.

A) measure of spread of data

• B.

B) avoiding comparability between the groups.

• C.

C) the mid- point of data

• D.

D) none of the above

• 9.
9-Normal law means :
• A.

A) there is a relation between the two variables in the study

• B.

B) normal distribution of the majority of biological variables

• C.

C) operationalization of an observed event

• D.

D) all answers are correct

• 10.
10-The disadvantage of conversion from Numerical data to categorical data is:
• A.

A) loss of data

• B.

B) help to make decisions

• C.

C) retain information

• D.

D) increasing bias

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