Module 1 Practice Questions (2)

Front

What is a boxplot?

Back

A boxplot is a graphical representation of data that shows the distribution's minimum, first quartile, median, third quartile, and maximum. It helps visualize the spread and identify outliers.

Front

What does the term 'histogram' refer to?

Back

A histogram is a graphical representation of the distribution of numerical data, where the data is divided into bins or intervals, and the frequency of data points in each bin is represented by the height of the bars.

Front

What does standard deviation measure?

Back

Standard deviation measures the amount of variation or dispersion in a set of values. A low standard deviation indicates that the values tend to be close to the mean, while a high standard deviation indicates that the values are spread out over a wider range.

Front

What is the empirical rule in statistics?

Back

The empirical rule states that for a normal distribution, approximately 68% of the data falls within one standard deviation of the mean, about 95% falls within two standard deviations, and about 99.7% falls within three standard deviations.

Front

What is the mean in a data set?

Back

The mean is the average of a set of numbers, calculated by adding all the values together and dividing by the number of values.

Front

What is a normal distribution?

Back

A normal distribution is a probability distribution that is symmetric about the mean, showing that data near the mean are more frequent in occurrence than data far from the mean.

Front

What is the significance of outliers in data analysis?

Back

Outliers are data points that differ significantly from other observations. They can skew the results and affect the mean and standard deviation, making it important to identify and analyze them.

Front

How do you interpret a histogram?

Back

To interpret a histogram, look at the shape, center, and spread of the data. The height of the bars indicates the frequency of data points within each interval, helping to identify patterns and trends.

Front

What is the difference between the mean and median?

Back

The mean is the average of all data points, while the median is the middle value when the data points are arranged in order. The median is less affected by outliers than the mean.

Front

What does it mean for a distribution to be skewed?

Back

A distribution is skewed if it is not symmetrical, meaning that one tail is longer or fatter than the other. Right skewed (positive skew) has a longer right tail, while left skewed (negative skew) has a longer left tail.