Pearson Edexcel Level 3 GCE 8FM0/23 2022 Further Mathematics Advanced Subsidiary Further Mathematics options 23: Further Statistics 1 (Part of options B, E, F and G)

Document Content and Description Below

1. Stuart is investigating a treatment for a disease that affects fruit trees. He has 400 fruit trees and applies the treatment to a random sample of these trees. The remainder of the trees have no ... treatment. He records the number of years, y, that each fruit tree remains free from this disease. The results are summarised in the table below. Treatment Applied Not applied Number of years free from this disease y < 1 15 25 1  y < 2 35 61 2  y 124 140 The data are to be used to determine whether or not there is an association between the application of the treatment and the number of years that a fruit tree remains free from this disease. (a) Calculate the expected frequencies for (i) Applied and y < 1 (ii) Not applied and 1  y < 2 (2) The value of O E −E ( ) ∑ 2 for the other four classes is 2.642 to 3 decimal p [Show More]

Last updated: 1 year ago

Preview 1 out of 16 pages