DAC DAC Statistical Methods & Analytics

Question 1

What does the term 'mean' refer to in descriptive statistics?

Accepted Answer

The arithmetic average of all values

Answer

The mean is calculated by summing all data values and dividing by the count of values, giving the arithmetic average.

Question 2

Which measure of central tendency is most resistant to the influence of extreme outliers?

Accepted Answer

Median

Answer

The median, being the middle value of a sorted dataset, is not affected by extreme outliers the way the mean is.

Question 3

In hypothesis testing, what does a p-value less than 0.05 typically indicate?

Accepted Answer

There is statistically significant evidence to reject the null hypothesis

Answer

A p-value below the significance threshold (commonly 0.05) indicates the observed results are unlikely under the null hypothesis, supporting its rejection.

Question 4

What does standard deviation measure in a dataset?

Accepted Answer

The average distance of data points from the mean

Answer

Standard deviation quantifies how spread out the data values are around the mean — a larger value indicates more variability.

Question 5

Which type of correlation coefficient is used to measure the linear relationship between two continuous variables?

Accepted Answer

Pearson's r

Answer

Pearson's r measures the strength and direction of the linear relationship between two continuous, normally distributed variables.

Data Analytics Certifications (DAC) Practice Test

Data Analytics Certifications (DAC) Practice Test

DAC DAC Statistical Methods & Analytics