qIn an experiment, forty measurements of air temperature were made. The mean and standard deviation of
the sample are:
q x = 18.41°C and s = 0.6283°C.
q
qQuestion 1:
q Calculate the 95% confidence interval for the population mean
for these data.
q
qAnswer:
q From the previous slid, we know the
interval is: x ± Z95% * s / (N)0.5
q Z95% = 1.96
q Z95% * s / (N)0.5 = 1.96 * 0.6283°C / (40 )0.5 = 0.1947°C
q The 95% confidence level for the population mean: 18.22°C ~ 18.60°C.