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Grades on three exams and overall course grade for 233 students during several years for a statistics course at a university.

Usage

exam_grades

Format

A data frame with 233 observations, each representing a student.

semester

Semester when grades were recorded.

sex

Sex of the student as recorded on the university registration system: Man or Woman.

exam1

Exam 1 grade.

exam2

Exam 2 grade.

exam3

Exam 3 grade.

course_grade

Overall course grade.

Examples


library(ggplot2)
library(dplyr)

# Course grade vs. each exam
ggplot(exam_grades, aes(x = exam1, y = course_grade)) +
  geom_point()
#> Warning: Removed 1 rows containing missing values (geom_point).


ggplot(exam_grades, aes(x = exam2, y = course_grade)) +
  geom_point()


ggplot(exam_grades, aes(x = exam2, y = course_grade)) +
  geom_point()


# Semester averages
exam_grades %>%
  group_by(semester) %>%
  summarise(across(exam1:course_grade, mean, na.rm = TRUE))
#> # A tibble: 6 × 5
#>   semester exam1 exam2 exam3 course_grade
#>   <chr>    <dbl> <dbl> <dbl>        <dbl>
#> 1 2000-1    73.8  76.2  76.8         72.3
#> 2 2000-2    75.5  71.2  68.0         70.6
#> 3 2001-1    87.0  75.1  78.1         76.7
#> 4 2001-2    82.9  67.5  67.2         69.0
#> 5 2002-1    82.1  76.3  84.9         72.3
#> 6 2003-1    85.7  67.8  77.1         72.3