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BIOSTATISTICS- Introduction, Measure of central tendency

Short Quiz on BIOSTATISTICS- Introduction, Measure of central tendency

Instruction

1. This Test has 5 Questions
2. There is 1 Mark for each correct Answer

MCQ – 1

Mean and standard deviation can be worked out only if data is on –

Interval/Ratio scale

Dichotomous scale

Nominal scale

Ordinal scale

Explanation :

Ans. is \’a\’ i.e., Interval/Ratio scale

It is the arithmetic average of the individual values divided by the number of variables.

Thus quite logically, mean is useful only for quantitative variables (ie Interval and Ratio Scale data) which have got a measurable attribute.

o Standard Deviation

It\’s the measure of variance, calculated by method which everyone of us are well aware. It first involves findings out the mean value. Thus SD can only be worked out for quantitative data (Interval and ratio scales). o Now lets see other measures of central tendency and measures of variation.

MCQ – 2

A researcher selected all possible samples from a population and plotted their means on a line graph. This distribution is called

Sample distribution

Sampling distribution

Population distribution

Parametric distribution

Explanation :

Ans: B. Sampling distribution

Sampling distribution / finite-sample distribution:

The probability distribution of a given statistic based on a random sample.
They allow analytical considerations to be based on the sampling distribution of a statistic, rather than on the joint probability distribution of all the individual sample values.

MCQ – 3

Which of the following is true regarding the following image?

Mean = Median = Mode

Mean = Median, not equal to Mode

Mean = Mode, not equal to Median

Mean, Median and Mode are not equal

Explanation :

Ans: B. Mean = Median, not equal to Mode

Redline indicates normal distribution hence Mean = Median
Blueline indicates bimodal distribution hence 2 Modes.
So Mean = Median but not equal to Mode

MCQ – 4

A study was conducted to find out number of positive lymph nodes in a population of breast cancer patients who underwent axillary dissection. A graph was plotted between the number and frequency of positive nodes as below. Which of the following is the correct statement?

A; Mode B: Median C: Mean

A: Mode B: Mean C: Median

A: Median B: Mode C: Mean

A: Mean B: Median C: Mode

Explanation :

Ans: A. A; Mode B: Median C: Mean

(Ref Park 23/e p847, 24/e p884)

Distribution	Central Tendency
Normal (Gaussian) Distribution	Mean = Median = Mode°
Right (Positive) Skew Distribution	Mean >Median >Mode°
Left (Negative) Skew Distribution	Mean

MCQ – 5

The values of systolic BP in a given data are 120, 120, 130, 120, 110, 110, 200. Which of the following will be best to use for central tendency in the given data?

Mean

Median

Mode

Harmonic mean

Explanation :

Ans.A. Mean

Arithmetic mean

It is the most commonly used statistical average.
To calculate the mean, add up the values of all individual observations and then divide by the number of observations.
The process of adding together is called summation and is denoted by the sign E or S.

Short Quiz on BIOSTATISTICS- Introduction, Measure of central tendency

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Short Quiz on BIOSTATISTICS- Introduction, Measure of central tendency

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