22 6 (a) State the definition of a statistic. (2) _____________________________________________________________________________________ _____________________________________________________________________________________ _____________________________________________________________________________________ _____________________________________________________________________________________ _____________________________________________________________________________________ _____________________________________________________________________________________ _____________________________________________________________________________________ A biscuit manufacturer claims that each packet contains, on average, 200 g of its biscuits. Lionel wants to test this claim. He takes a random sample of 12 packets of the biscuits and weighs their contents. The mean weight of his sample is 192 g with a standard error of 4.91 g. (b) In Figure 7, put a tick against the numbers, taken from the above information, that are statistics. (1) 200 g 192 g 4.91 g Figure 7 (c) Use Lionel’s data to calculate a 95% confidence interval for the mean weight of a packet of biscuits. (3) _____________________________________________________________________________________ _____________________________________________________________________________________ _____________________________________________________________________________________ _____________________________________________________________________________________ _____________________________________________________________________________________ _____________________________________________________________________________________ _____________________________________________________________________________________ _____________________________________________________________________________________ _____________________________________________________________________________________ _____________________________________________________________________________________ _____________________________________________________________________________________
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Exam Specification Info
This question is part of the UK A-Level Mathematics syllabus. In the actual exam, structured questions typically require linking specific keywords to gain full marks. Applaa helps you drill these topics.
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