for confidence intervals and hypothesis tests

- SE for a single mean: No calculator is provided
here.

Use the sample standard deviation divided by the square root of the sample size.

Use the summary statistic calculator with the sample data to find the sample standard deviation. http://visualize.tlok.org/elem-stat/statistic.php

- SE for difference of means of paired data

For each pair, compute the difference. Consider the collection of these differences as the data. Analyze it as data on one sample mean.

- SE for the difference of sample means from independent samples
SE sample means

If necessary, use the summary statistic calculator with each set of sample data to find its sample standard deviation. http://visualize.tlok.org/elem-stat/statistic.php

This SE calculator also gives the accurate value for the degrees of freedom. Round to the nearest whole number to use a t-table to find probabilities in the appropriate t-distribution.

- SE for a single proportion SE one sample proportion

- SE for the difference of sample proportions SE sample proportions

- Difference of two sample means from two independent
samples:
http://visualize.tlok.org/elem-stat/elem-stat/standard_error_diff_two_sample_means.php

- One proportion: h http://visualize.tlok.org/elem-stat/standard_error_one_sample_proportion.php
- Difference of two sample proportions from independent
samples:
http://visualize.tlok.org/elem-stat/standard_error_diff_two_sample_proportions.php

See calculators for theoretical sampling distributions

ANOVA for Difference of Means when given summarized data. http://www.tlok.org/visualize/elem-stat/anova_difference_of_means.php

With example http://www.tlok.org/visualize/elem-stat/anova_difference_of_means.php?file=anova_example.txt