What level of confidence can be attributed to this interval

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1. An interval estimate for the average distance car tyres lasted during their "lifetime" was reported to be 33112 km to 36775 km. This interval estimate was based on a sample of 47 tyres. The variance of the lifetime was determined from previous studies to be 44885212 km squared. What level of confidence can be attributed to this interval estimate? State your answer as a percentage, correct to the nearest whole number.

2. Sleep apnoea is a sleep disorder that causes a person to stop breathing momentarily and then awaken briefly. A study of 537 Victorian commercial truck drivers found that 98 of them suffered from sleep apnoea. Use the survey results to estimate, with 93% confidence, the proportion of Victorian commercial truck drivers who suffer from this sleeping disorder. Report the upper bound of the interval only, giving your answer as a percentage to two decimal places.

Reference no: EM132378934

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