Mathematics (AS & A Level) · Oct / Nov 2021 · Paper 61 · Question 3
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A random sample of 75 students at a large college was selected for a survey. 15 of these students said that they owned a car. From this result an approximate !% confidence interval for the proportion of all students at the college who own a car was calculated. The width of this interval was found to be 0.162. Calculate the value of ! correct to 2 significant figures. [5]
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