Here are some problems that our users have asked and received explanations on
I'm trying to find the mean,range,mode and standard deviation of a sample. Basic statistics in Excel
Solved by B. W. in 25 mins
Calculate the difference of a rounded standard deviation and actual standard deviation when there is a 95% and 99% confidence intervals for the population mean given a sample of 36 resulted in a mean of 55 and a rounded standard deviation of 18
Solved by A. F. in 26 mins
Average weekly manufacturing earnings were $480 and the standard deviation was $72. A recent sample of 36 resulted in a mean of $450. The standard deviation has not changed. Test the null hypothesis by using 95% level of significance whether average weekly earnings changed.
Solved by O. S. in 25 mins
In cell B2, calculate the probability of selling the exact number of products calculated in cell A2, using the normal distribution function and the mean and sample standard deviation calculated in the prior step.
Solved by K. L. in 13 mins
Ace Realty wants to determine whether the average time it takes to sell homes is different for its two offices. A sample of 40 sales from office #1 revealed a mean of 90 days and a standard deviation of 15 days. A sample of 50 sales from office #2 revealed a mean of 100 days and a standard deviation of 20 days. Use a .05 level of significance.