general knowledge

All are measures of central tendency EXCEPT

• Mean

• Median

• Mode

• Standard deviation

Correlation takes values from 0 to 1 and can't take a negative value

• True

• False

Frequency tables is used to describe categorical data

• True

• False

The following function (%>%) can be called when library() which package(s)

You can choose more than one answer if possible

• library(dplyr)

• library(tidyverse)

• library(ggplot2)

• library(ggplot1)

Which of the following R code snippets correctly assigns the vector c(1, 2, 3) to the variable my_vector?

you can choose more than one answer if possible

• my_vector <- 1, 2, 3

• my_vector >- c(1, 2, 3)

• my_vector <- c(1, 2, 3)

• my_vector = 1:3

What is the meaning of this code

salary$money

• select the column Money from dataframe called salary

• change the unit of column called money into dollars

• select a column called salary from a dataframe called money

• change the unit of column called salary into dollars