Ann pose la question : my son is in the fifth grade and they are doing estimate products rounding both factors, he knows how to round off a decimal, but he is having a problem doing a decimal and a whole number for example 5.96x3=? He knows the 5.96 round off to 6. but what does the 3 round off to? Penny Nom lui répond.
Jack Hook pose la question : I'm a contractor and need to estimate how much time it will take me to do a specific job. A previous job I did was 6,480.16 Square Feet and I was able to paint it in 31.5 hours. In estimating my next job, how many hours will it take me to paint 11,000 Sqare Feet. Penny Nom lui répond.
John Barekman pose la question : Statitistics: Estimating the population mean when the standard deviation is known:
I am not sure which n to use in the formula for the confidence interval equation:
x +/- z*(standard deviation/sqrt(n))
If we have data of ten people, and if we have the data of ten sets of ten people each, what is the difference in the n that we use? What is the difference between the standard deviation and the standard error? Are we using the number of sampling means or just the number of samples?