Mathematics (AS & A Level) · Feb / March 2019 · Paper 72 · Question 6
9709
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The question as text
The time taken by volunteers to complete a certain task is normally distributed. In the past the time, in minutes, has had mean 91.4 and standard deviation 6.4. A new, similar task is introduced and the times, t minutes, taken by a random sample of 6 volunteers to complete the new task are summarised by Σt = 568.5. Andrea plans to carry out a test, at the 5% significance level, of whether the mean time for the new task is different from the mean time for the old task.
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6(i)[1]
6(ii)[2]
6(iii)[7]
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