The following table shows the mean daily average temperature in San Diego, California for each of the 12 months of the year:
Month Jan Feb Mar Apr Nay June July Aug Sep Oct Nov Dec
°F 54.9 55.9 57.6 59.9 62.2 65.1 68.7 70.2 68.5 64.8 60.1 56.1
Construct a 95% confidence interval for the mean annual temperature in San Diego, California, think about the sample size when doing this.
This posting provides details of calculation of 95% confidence interval for mean temperature.