Exam-style questions in the shape of Paper 1 and Paper 2, with full markschemes. Read the markscheme, or type, photograph or draw your answer and get it marked.
A clinic records whether each of 100 patients has a particular exposure, and whether they have a condition, Figure 1 shows the results.
Write down the formula for assuming
Use Figure 1 for both parts.
Calculate
Determine whether and are independent. Give a reason.
A probability tree models the results of a medical study of a risk factor and a disease A person is selected at random from the population. The probabilities on the second set of branches are conditional on the outcome at the first set of branches.
Find the probability that a randomly selected person has both and
Hence determine the probability that a randomly selected person has
Hence determine the probability that a person has given that they have Give your answer exactly, and state whether more than half of the people with have
A health service records whether each of 300 participants has a risk factor and whether each is diagnosed with a disease Figure 1 shows the results.
A report notes that more participants diagnosed with had than did not have and concludes that diagnosis is more likely among participants with
State the definition of in terms of and
Use Figure 1 to calculate
In light of your answer to (b), test whether and are independent and assess the report’s conclusion.
Unlock every question in this topic, then type, photograph or draw your answer and have it marked against the markscheme. Find out where you are dropping marks.