astatsstudent
11-08-2009, 09:16 AM
I am really confused by the following question:
Here is some information that I feel is relevant from part a)
- Annual rainfall totals can be approximated by a normal distribution, with a mean of 752.4mm and a standard deviation of 105.578mm.
Part b)
The rainfall totals obtained above are a sample.
The arithmetic mean of 752.4mm is thus called a sample mean. The population mean would be calculated from an infinitely long series of annual rainfall totals. Using the sample mean, calculate a 95% confidence interval of the population mean of annual rainfall totals.
Show all of your working, & indicate whether you have used the z or t distribution and why.
If anyone may be able to point me in the right direction, I would be really thankful!
Here is some information that I feel is relevant from part a)
- Annual rainfall totals can be approximated by a normal distribution, with a mean of 752.4mm and a standard deviation of 105.578mm.
Part b)
The rainfall totals obtained above are a sample.
The arithmetic mean of 752.4mm is thus called a sample mean. The population mean would be calculated from an infinitely long series of annual rainfall totals. Using the sample mean, calculate a 95% confidence interval of the population mean of annual rainfall totals.
Show all of your working, & indicate whether you have used the z or t distribution and why.
If anyone may be able to point me in the right direction, I would be really thankful!