Category: Statistics

Histogram is the most common graph used to represent numerical data. Histogram looks similar to a bar chart but is very different. In a bar chart, only the vertical axis represents numerical data(absolute frequency) but in Histogram, both the vertical and horizontal axis represents numerical data. Each bar in a histogram has a width equal…

Usually, numerical variables by default will have a frequency of 1 most of the time making the frequency table impractical for any analysis. Dataset Frequency 1 1 9 1 22 1 24 1 32 1 41 1 44 1 48 1 57 1 66 1 70 1 73 1 75 1 76 1 79 1…

Some of the common ways to visualize categorical variables: Frequency Distribution Table: Brand Frequency Brand A 84 Brand B 67 Brand C 102 Total 253 Bar Chart: Bar charts are useful to visually compare items/groups among each other based on their frequency Pie Chart: Pie charts are useful when we not only want to compare…

Data can be classified in two main ways: Based on the type of data and measurement level. Types of Data: Levels of Measurement:

Population Sample Samples are key to accurate statistical insights. A Sample must be both Random and Representative for an accurate statistical insight. Randomness: A random sample is collected when each member of the sample is chosen from the population strictly by chance Representativeness: A Representative sample is a subset of the population that accurately reflects…