Daily Practice

Higher

8th January 2025

5 questions · Higher tier · 360 questions in this band

1
Data Cleaning and Outliers (Higher)
A data set of ages is: 12, 13, 12, 14, -12, 13. Which value is clearly an error, and why?
2
Correlation and Causation (Higher)
A study calculates a correlation coefficient of -0.85 between hours of television watched and exam grade. Does this prove watching television causes lower grades? Give a reason.
3
Risk (Higher)
Out of 800 patients given a placebo, 8 experienced nausea. Find the risk of nausea as a percentage.
4
Standard Deviation
Find the standard deviation of the data set 1, 2, 3, 4, 5, giving your answer to 2 decimal places.
5
Standardised Scores
A value has a standardised score of 0. What does this tell you about the value?

You are looking at an earlier sheet. Today's sheet is the one that adds a day.

Your run is kept in this browser only, and there is no account.

Any date always gives the same five questions, so a sheet can be set again or shared. All of January 2025, including the monthly compilation PDF.