While Excel is useful for many applications, it is an indispensable tool for those managing statistics. Two common terms used in statistics are Standard Deviation and ...

Wondering how many people in the United States have a smartphone? If you poll 20 people on the street, your survey won’t be representative of the entire American population. But if you just want to ...

In the previous lab, we saw that if we have the standard deviation for the population, we can use use $z$-score to calculate our confidence interval using the mean of ...

Calculating the mean is one of many methods of finding an average. To calculate the mean, you add up all the numbers in the set, then divide the total by the number of numbers you added. The mean ...

R package to calculate the sample size for the development of risk models for binary outcomes Related paper: "An evaluation of sample size requirements for developing ...