Descriptive statistics in R Programming - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to calculate the mean of the numeric vector data.

R Programming

mean_value <- mean([1])

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Amean

Bdata

Csum

Dmedian

Attempts:

3 left

💡 Hint

Common Mistakes

Putting the function name inside itself instead of the data vector.

Using sum or median instead of the data vector.

The mean() function calculates the average of the values in the vector. We pass the vector data as the argument.

2fill in blank

medium

Complete the code to calculate the median of the numeric vector values.

R Programming

median_value <- [1](values)

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Amedian

Bmean

Csum

Dmin

Attempts:

3 left

💡 Hint

Common Mistakes

Using mean instead of median.

Using sum or min which do not calculate the median.

The median() function returns the middle value of the sorted vector, which is the median.

3fill in blank

hard

Fix the error in the code to calculate the standard deviation of scores.

R Programming

std_dev <- sd([1])

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Ascore_vector

Bscore

Cscore_list

Dscores

Attempts:

3 left

💡 Hint

Common Mistakes

Using a variable name that does not exist like score.

Misspelling the variable name.

The variable holding the data is named scores. Using the correct variable name avoids errors.

4fill in blank

hard

Fill both blanks to create a named list with mean and median of data_vec.

R Programming

stats <- list(mean = [1](data_vec), median = [2](data_vec))

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Amean

Bmedian

Csum

Dsd

Attempts:

3 left

💡 Hint

Common Mistakes

Using sum or sd instead of mean or median.

Mixing the order of mean and median.

The list contains the mean and median calculated by their respective functions on data_vec.

5fill in blank

hard

Fill all three blanks to create a named list with mean, median, and standard deviation of nums.

R Programming

summary_stats <- list([1] = [2](nums), median = [3](nums), sd = sd(nums))

Drag options to blanks, or click blank then click option'

Amean

Cmedian

Dsd

Attempts:

3 left

💡 Hint

Common Mistakes

Using median as the key instead of mean.

Mixing up the order of keys and functions.

The list keys and functions are: mean (key and function), median (key and function), and sd (key and function).