Quiz before Statistical Methods

What does the mean represent in a dataset?

• The sum of all the numbers in a dataset divided by the total count of numbers

• The middle value when the numbers are arranged in order

• The most frequently occurring number

• The difference between the largest and smallest number

Which of the following best describes the median?

• The value that occurs most often in the dataset

• The average value of the dataset

• The middle value of the dataset when arranged in order

• The range of the dataset

The mode of a dataset is defined as:

• The value that appears most frequently in the dataset

• The average of the highest and lowest values in the dataset

• The total sum of all numbers in the dataset

• The central value when the dataset is ordered

What does the range of a dataset indicate?

• The difference between the highest and lowest values

• The sum of all numbers in the dataset

• The middle value of the dataset

• The number of items in the dataset

Which of the following best explains standard deviation?

• The difference between the largest and smallest values

• A measure of the spread of numbers in a dataset

• The sum of all squared differences from the mean

• The middle value when numbers are arranged in order

Variance (VAR) is a measure of:

• The average squared difference from the mean

• The most frequent value in the dataset

• The difference between the largest and smallest values

• The sum of all values in the dataset

When all values in a dataset are the same, what is the standard deviation?

• Zero

• One

• The same as the mean

• Undefined

Which of the following is true about the relationship between standard deviation and variance?

• Standard deviation is the square of the variance

• Variance is the square root of the standard deviation

• Standard deviation is the square root of the variance

• Variance is unrelated to standard deviation

If a dataset has two modes, it is described as:

• Unimodal

• Bimodal

• Multimodal

• Non-modal

Which of the following best describes the impact of outliers on the mean?

• The mean is highly influenced by outliers

• The mean is not affected by outliers

• The mean and median are equally influenced by outliers

• The mean becomes the mode when outliers are present