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Question 1
A marine biologist records the water temperature (°C) and the number of whale sightings per day at a coastal observation station over a 10-day period. The data is shown in the table below.
Determine whether water temperature and whale sightings represent bivariate data, identify the type of each variable, classify the association shown in the data, and calculate the percentage of days when water temperature was below 16°C and whale sightings exceeded 8.
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Question 2
A researcher collects data on 150 students, recording their age (in years) and their mathematics test score (out of 100).
(a) State the two variables in this dataset. (1 mark)
(b) Calculate the number of paired observations in this dataset. (1 mark)
(c) If 45 students are aged 16 years, calculate the percentage of the sample that is aged 16 years. Give your answer correct to one decimal place. (1 mark)
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Question 3
Which of the following scenarios describes a bivariate dataset?
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