Statistical tests for means

 Original: English

Label In this page you can determine if the mean of a sample differs significantly from a specified value or if the means of two samples are statistically different. The calculator is designed to be as practical and intuitive as possible returning a straight answer. The tool can assist users to solve problems like:

1 / 3
In a company, historic data indicate that the average sale was \$200 per transaction. After training your sales team, recent sales data (taken from a sample of 40 salesmen) indicates an average sale of \$220, with a standard deviation of \$17. Did the training work?
2 / 3
As a supervisor of an administrative process, you have developed a different method to perform a task. Now you wish to confirm statistically if the average time of the new method is better.

3 / 3
A survey with 5000 individuals reported that 1500 are left-handed (30% of the sample). Is there enough evidence that the proportion of left-handed in the population is higher than 25%?

Label Just follow the steps below. You can hover over the options for additional information.

Step 1) What would you like to compare ? Select one option:

 Compare sample mean with a target value.Compare sample proportion (%) with a target value.Compare means of two samples.Compare means of a paired sample.Compare proportion (%) of two samples. Compare means of 3 samples or more

Step 2) Enter the desired configuration of the test.

 Type of Alternative Hipothesis different < > Hypothesized difference Confidence Level 90% 95% 99%

Step 3) Enter the sample information.

 Sample 1 Sample 2 Sample 3 Sample 4 Sample 5 Sample 6 Sample size (n) Sample mean Standard dev.

Find us on