Descriptive Statistics: Master Data Analysis for Pharmacy

Question 1

Which of the following is NOT a measure of central tendency?

Accepted Answer

Standard deviation

Answer

Mean

Answer

Median

Answer

Mode

Question 2

What is the formula for calculating the mean of a dataset?

Accepted Answer

Sum of all values divided by the number of values

Answer

Value that appears most frequently

Answer

Middle value when the dataset is arranged in ascending or descending order

Answer

Average of the highest and lowest values

Question 3

A dataset has the following values: 5, 7, 9, 11, 13. What is the median?

Accepted Answer

9

Answer

7

Answer

11

Answer

13

Question 4

What type of graphical representation is most suitable for comparing multiple datasets?

Accepted Answer

Bar chart

Answer

Histogram

Answer

Scatter plot

Answer

Line graph

Question 5

Which of the following is NOT an assumption of the normal distribution?

Accepted Answer

Mean, median, and mode are equal

Answer

Symmetrical bell-shaped curve

Answer

Data is randomly distributed

Answer

Standard deviation is positive

Question 6

A researcher collects data on the weights of 100 adults. The mean weight is 75 kg with a standard deviation of 10 kg. What is the z-score of an individual weighing 85 kg?

Accepted Answer

0

Answer

-1

Answer

1

Answer

2

Question 7

In a dataset with a negatively skewed distribution, the:

Accepted Answer

Median is greater than the mean

Answer

Mean is greater than the median

Answer

Distribution is symmetrical

Answer

Mean and median are equal

Question 8

Which of the following is a measure of central tendency, and is calculated by finding the sum of all values and dividing by the number of values in a dataset?

Accepted Answer

Mean

Answer

Standard deviation

Answer

Variance

Answer

Range

Question 9

What is the expression used to determine the variance of a data set?

Accepted Answer

Sum of squared deviations from the mean divided by (n-1)

Answer

Sum of squared deviations from the median divided by n

Answer

Sum of absolute deviations from the mean divided by n

Answer

Mean minus median

Question 10

Which of the following graphical representations primarily displays the distribution of data values into equal intervals, providing a visual representation of frequency?

Accepted Answer

Histogram

Answer

Bar chart

Answer

Pie chart

Answer

Scatterplot

Question 11

Which measure of dispersion is most susceptible to extreme values, often providing a more exaggerated indication of the spread of data?

Accepted Answer

Range

Answer

Standard deviation

Answer

Variance

Answer

Interquartile range

Question 12

What is the primary distinction between the mean and the median?

Accepted Answer

The mean is influenced by outliers, while the median is not

Answer

The median is influenced by outliers, while the mean is not

Answer

Both the mean and the median are affected by outliers

Answer

Neither the mean nor the median is affected by outliers

Question 13

What is the primary purpose of using a stem-and-leaf plot?

Accepted Answer

To visually represent the distribution of data in a simple and easy-to-understand format

Answer

To calculate the mean and median of a data set

Answer

To quickly identify outliers within a data set

Answer

To compare and contrast two or more data sets

Question 14

What is the essence of the central limit theorem?

Accepted Answer

As the sample size increases, the distribution of sample means approaches the normal distribution, regardless of the shape of the population distribution

Answer

The mean of a sample is always equal to the mean of the population

Answer

The standard deviation of a sample is always equal to the standard deviation of the population

Answer

The shape of a distribution does not matter when calculating the mean

Question 15

Which of the following is a measure of dispersion, rather than a measure of central tendency?

Accepted Answer

Standard Deviation

Answer

Mean

Answer

Median

Answer

Mode

Question 16

Which of the following is a measure of how spread out a dataset is, rather than a measure of its central value?

Accepted Answer

Standard deviation

Answer

Mean

Answer

Median

Answer

Mode

Question 17

Which of the following is NOT a measure of central tendency?

Accepted Answer

Standard deviation

Answer

Mean

Answer

Median

Answer

Mode

Question 18

The sum of all deviations from the mean of a dataset is always:

Accepted Answer

0

Answer

Equal to the mean

Answer

Equal to the standard deviation

Answer

Equal to the variance

Question 19

The range of a dataset is:

Accepted Answer

The difference between the maximum and minimum values

Answer

The difference between the mean and median

Answer

The difference between the standard deviation and variance

Answer

The difference between the first and third quartiles

Question 20

The standard deviation measures:

Accepted Answer

Dispersion

Answer

Central tendency

Answer

Skewness

Answer

Kurtosis

Question 21

Which of the following is NOT a type of box plot?

Accepted Answer

Stem-and-leaf plot

Answer

Tukey box plot

Answer

Whisker box plot

Answer

Violin plot

Question 22

If the mean of a set of numbers is 10, and each number is multiplied by 2, the new mean will be:

Accepted Answer

20

Answer

10

Answer

30

Answer

40