Daily Practice

Higher

1st February 2025

5 questions · Higher tier · 360 questions in this band

1
Data Cleaning and Outliers (Higher)
A data set of 10 house prices, in thousands of pounds, has a mean of 210 without an outlier of 900 included, but a mean of 279 when the 900 is included. Explain why a statistician might exclude the 900 when reporting a typical house price.
2
Correlation and Causation (Higher)
A correlation coefficient of 0.95 is calculated between two variables. What does this value tell you about the strength of the relationship?
3
Risk (Higher)
Out of 800 patients given Drug A, 16 experienced nausea. Find the risk of nausea as a percentage.
4
Standard Deviation
Find the standard deviation of 10, 12, 14, 16, 18, giving your answer to 2 decimal places.
5
Standardised Scores
In a science test, the mean is 48 and the standard deviation is 6. Tom scored 60. Find his standardised score.

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