Course home

2.5.3 Hypothesis test for a Normal mean (A-level only)

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89

Question 83

The mass of a high-precision turbine blade is modelled by a normal distribution with a mean of $450.0$ g and a standard deviation of $12.4$ g. After a change in the manufacturing process, a quality control engineer suspects that the mean mass of the blades has decreased. A random sample of $50$ blades is measured, and the sample mean mass is found to be $446.2$ g. Carry out a hypothesis test at the $2%2\%$ significance level to investigate the engineer's suspicion.

[5]

Markscheme

2.5.3 Hypothesis test for a Normal mean (A-level only) Questions

A Level
Maths
2.5.3 Hypothesis test for a Normal mean (A-level only)

130 exam-style questions on AQA A Level Maths 2.5.3 Hypothesis test for a Normal mean (A-level only). Each one has a worked solution and a mark scheme showing where the marks go.

2.5.3 Hypothesis test for a Normal mean (A-level only)

Question bank

2.5.3 Hypothesis test for a Normal mean (A-level only)

Medium Hard

Question 83

[5]

Markscheme

2.5.3 Hypothesis test for a Normal mean (A-level only) Questions

A Level
Maths
2.5.3 Hypothesis test for a Normal mean (A-level only)

130 exam-style questions on AQA A Level Maths 2.5.3 Hypothesis test for a Normal mean (A-level only). Each one has a worked solution and a mark scheme showing where the marks go.