Mathematics, 16.03.2020 19:00 ewaltz74

An article reported that for a sample of 45 kitchens with gas cooking appliances monitored during a one-week period, the sample mean CO2 level (ppm) was 654.16, and the sample standard deviation was 164.21.

Suppose the investigators had made a rough guess of 180 for the value of s before collecting data. What sample size would be necessary to obtain an interval width of 48 ppm for a confidence level of 95%?

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