CEA Data Analysis & Statistical Methods

Question 1

What is the mean in statistics?

Accepted Answer

The average value

Answer

In statistics, the mean is the most common measure of central tendency, representing the average value of a dataset. It is calculated by summing all the values in a set and then dividing by the total number of values. The mean provides a single value that summarizes the typical magnitude of the data.

Question 2

What does standard deviation measure?

Accepted Answer

Variation or dispersion

Answer

Standard deviation is a widely used measure of the dispersion or spread of data points around the mean in a dataset. A low standard deviation indicates that data points tend to be close to the mean, while a high standard deviation suggests data points are spread out over a wider range. It helps understand the variability within a dataset.

Question 3

What is a hypothesis test used for?

Accepted Answer

Test claims about populations

Answer

A hypothesis test is a statistical method used to make inferences or draw conclusions about a population based on sample data. It involves formulating a null hypothesis and an alternative hypothesis, then using statistical evidence to determine whether there is enough support to reject the null hypothesis in favor of the alternative. This allows researchers to test specific claims or theories.

Question 4

What is correlation?

Accepted Answer

Strength of relationship

Answer

Correlation is a statistical measure that describes the extent to which two variables tend to move together. It quantifies the strength and direction of a linear relationship between two variables, ranging from -1 (perfect negative correlation) to +1 (perfect positive correlation). It's important to note that correlation does not imply causation.

Question 5

What is the median of a data set?

Accepted Answer

The middle value

Answer

The median is a measure of central tendency that represents the middle value in a dataset when the data points are arranged in ascending or descending order. If there is an even number of data points, the median is the average of the two middle values. It is less affected by extreme outliers than the mean, making it useful for skewed distributions.

(CEA) Certified Economic Analyst Practice Test

(CEA) Certified Economic Analyst Practice Test

CEA Data Analysis & Statistical Methods