Daily Practice

Higher

28th October 2024

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?

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