# Question: a tyre manufacturer wants to measure the inner dimension in...

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A tyre manufacturer wants to measure the inner dimension (in millimetres) of a particular type of a tyre. A sample of 12 tyres is selected and dimension is recorded for each tyre. The sample mean dimension is 576.00 millimeters and the sample standard deviation is 6.21 millimeters. The lower limit of a 90% confidence interval for the population mean dimension (in millimetres) of tires is estimated to be _____________ (2 decimal places) Use z and t tables, not cas calculator.