Summary statistics in R Programming - Mini Project: Build & Apply

Summary statistics

📖 Scenario: You work as a data analyst for a small company. You have collected sales data for a week and want to understand the basic statistics like average sales, minimum, and maximum sales to help the team make decisions.

🎯 Goal: Build a simple R script that calculates summary statistics (mean, minimum, maximum) for daily sales data.

📋 What You'll Learn

Create a numeric vector with exact daily sales values

Create a variable to hold the number of days

Calculate mean, minimum, and maximum sales using built-in functions

Print the calculated summary statistics

💡 Why This Matters

🌍 Real World

Summary statistics help businesses quickly understand data like sales, customer visits, or production numbers.

💼 Career

Data analysts and scientists use summary statistics daily to describe data before deeper analysis.

1

Create the sales data vector

Create a numeric vector called sales with these exact daily sales values: 150, 200, 170, 220, 180, 210, 190.

R Programming

# Create the sales vector with the given values
# Your code here

Need a hint?

Use the c() function to combine numbers into a vector.

2

Create a variable for the number of days

Create a variable called num_days that stores the length of the sales vector using the length() function.

R Programming

sales <- c(150, 200, 170, 220, 180, 210, 190)
# Create num_days using length() on sales
# Your code here

Need a hint?

The length() function returns how many elements are in a vector.

3

Calculate summary statistics

Calculate the mean of sales and store it in avg_sales. Calculate the minimum and maximum sales and store them in min_sales and max_sales respectively. Use the functions mean(), min(), and max().

R Programming

sales <- c(150, 200, 170, 220, 180, 210, 190)
num_days <- length(sales)
# Calculate avg_sales, min_sales, max_sales
# Your code here

Need a hint?

Use mean(), min(), and max() functions on the sales vector.

4

Print the summary statistics

Print the variables avg_sales, min_sales, and max_sales each on a new line using the print() function.

R Programming

sales <- c(150, 200, 170, 220, 180, 210, 190)
num_days <- length(sales)
avg_sales <- mean(sales)
min_sales <- min(sales)
max_sales <- max(sales)
# Print avg_sales, min_sales, max_sales
# Your code here

Need a hint?

Use print() to show each statistic on its own line.