Data Science Unit 1-3 Review

Front

What is the definition of a bimodal distribution?

Back

A bimodal distribution is a probability distribution with two different modes, which can appear as two distinct peaks in the frequency of data.

Front

What does a correlation coefficient of 0.19 indicate?

Back

A correlation coefficient of 0.19 indicates that there is no significant correlation between the two variables being analyzed.

Front

What is the weakest negative correlation among the following: -0.73, -0.34, -0.92, -0.57?

Back

-0.34 is the weakest negative correlation.

Front

What does it mean if data is skewed to the right?

Back

If data is skewed to the right, it means that the tail on the right side of the distribution is longer or fatter than the left side, indicating that there are a number of unusually high values.

Front

Define uniform distribution.

Back

A uniform distribution is a type of probability distribution in which all outcomes are equally likely.

Front

What is an outlier in a dataset?

Back

An outlier is a data point that differs significantly from other observations in the dataset, often due to variability in the measurement or it being a result of experimental error.

Front

How do you interpret a correlation coefficient of -0.73?

Back

A correlation coefficient of -0.73 indicates a strong negative correlation, meaning that as one variable increases, the other variable tends to decrease.

Front

What is the purpose of data visualization?

Back

Data visualization is used to represent data graphically, making it easier to identify patterns, trends, and outliers.

Front

What is the mean of a dataset?

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 the median in a dataset?

Back

The median is the middle value in a dataset when the numbers are arranged in ascending or descending order.