Question

The stages of a malignant disease (cancer) is recorded using the symbols 0, I, II, III, IV. We
say that the scale used is:
A. Ordinal
B. Alphanumeric
C. Numerical
D. Nominal
2. Standard deviation:
A. is the square root of variance
B. is measured using the unit of the variable
C. is measured using the squared unit of the variable
D. has values generally comparable with the average value
3. The fundamental statistical indicators are:
A. Mean
B. Median
C. Variance
D. Standard deviation
4. The Confidence Interval for the mean, calculated for a series of values, has the
interpretation:
A. The true mean, the one that approximates the population’s mean, is almost certain
inside the confidence interval
B. The true variance is almost certain inside the confidence interval
C. The true median is almost certain inside the confidence interval
5. The average of a series of numerical values is:
A. The sum of the values divided by their number
B. Lower than the minimum value in the series
C. Lower than the maximum value in the series
D. An indicator of central tendency for the values of the series
6. The Sensitivity (SN) of a clinical trial
A. is the ratio of sick patients, diagnosed as positive, and the total number of sick
patients.
B. is the ratio of healthy subjects, diagnosed as negative, and the total number of healthy
subjects
C. is the ratio of sick patients, diagnosed as negative, and the total number of patients.
D is the ratio of sick patients, diagnosed as negative, and the total number of healthy

Answer 1

1. The stages of a malignant disease (cancer) is recorded using the symbols 0, I, II, III, IV. We

say that the scale used is:

A. Ordinal

Reason : the stages of malignant cancer is categorical data like I, II and so on. But since the order matters in the data it is ordinal data.

2. Standard deviation:

A. is the square root of variance

B. is measured using the unit of the variable

The standard deviation is given by,

3. The fundamental statistical indicators are:

A. Mean

D. Standard deviation

4. The Confidence Interval for the mean, calculated for a series of values, has the

nterpretation:

A. The true mean, the one that approximates the population’s mean, is almost certaini nside the confidence interval

5. The average of a series of numerical values is:

A. The sum of the values divided by their number

C. Lower than the maximum value in the series

D. An indicator of central tendency for the values of the series

6. The Sensitivity (SN) of a clinical trial

A. is the ratio of sick patients, diagnosed as positive, and the total number of sick patients.