Paired t-test error

[profwinkhaing]

Your code in line 242 for the Paired t-test encountered an error.
I trying in this way.

`### Split into paired groups
group1 <- all_combined$Frequency.Total[all_combined$AchievingGroup == "High achiever"]
group2 <- all_combined$Frequency.Total[all_combined$AchievingGroup == "Low achiever"]

Perform paired t-test

ttest_paired <- t.test(group1, group2, paired = TRUE)
ttest_paired`