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{"ops":[{"insert":"1. A magazine conducted a survey about the sleeping time of adults. A random sample\nof 12 adults were chosen from the adults travelling to work on a train.\na. Give reason why this is an unsatisfactory sample for the purpose of the study.\nb. State a population for which this sample would be satisfactory.\n\n2. A machine is designed to make paperclips with mean mass 4.00g and standard\ndeviation 0.08. The distribution of the masses of the paperclips is normal. A quality\ncontroller weighs a random sample of 25 paperclips and find their total mass to be\n101.2g.\na. Describe the use of hypothesis testing in real world. \nb. Conduct a hypothesis test at 5% significance level to test whether this provides\nevidence of an increase in the mean mass of the paperclips.\n"}]}
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