Speed data collected on an urban roadway yielded a standard deviation in speeds of 4.8 mi/h. (a) If an engineer wishes to estimate the average speed on the roadway at a 95% confidence level so that the estimate is within ±2 mi/h of the true average, how many spot speeds should be collected? No. of spot speed data for ±2 mi/h tolerance 22.13 4 (b) If the estimate of the average must be within ±1 mi/h, what should the sample size be? No. of spot speed data ±1 mi/h tolerance 88.51

Q: a) How many students are taking Art?

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