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2. If we take a random sample of counties in Oklahoma and look at the number...

2. If we take a random sample of counties in Oklahoma and look at the number of Covid-19 cases in each we could use that to estimate an average number of cases per county.

2 57 2 4 2

6 11 28 15 1

3 52 72 45 2

(a) Calculate the sample mean and sample variance.

(b) Assume that the numbers of cases in a county are normally distributed, and calculate a 95% confidence interval for the mean time using your sample statistics.

(c) Is this likely to actually be normally distributed? Why or why not?

I calculated the sample mean and variance through excel and got 20.133 for the mean, and 592.1238 for the variance, I don't know how to do (b) or (c) though.

Math   Statistics-And-Probability   
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