Hypothesis test of Pearson’s product-moment correlation coefficient
10
State appropriate hypotheses for Shona to use in her test.
10
(ii) Determine if there is sufficient evidence to reject the null hypothesis.
Fully justify your answer. [0pt]
[1 mark]
10
Shona's teacher tells her to remove calculation \(D\) from the table as it is incorrect.
Explain how the teacher knew it was incorrect. [0pt]
[1 mark]
10
Before performing calculation B, Shona cleaned the data. She removed all cars from the Large Data Set that had incorrect masses.
Using your knowledge of the large data set, explain what was incorrect about the masses which were removed from the calculation. [0pt]
[1 mark]
10
Apart from CO 2 and CO emissions, state one other type of emission that Shona could investigate using the Large Data Set.
10
Wesley claims that calculation C shows that a heavier car causes higher CO 2 emissions.
Give two reasons why Wesley's claim may be incorrect.