We will never get to know the exact votes of all voters in the given country. Like in the example of the election in a country. One problems will often occur with the z-score formula, because sigma is the standard deviation of the actual population, that we often don’t know. From this, we draw n independent observations and apply the test statistic formula also known as the z-score formula: Say we are about to conduct a sample from a normally distributed population. The t-distribution is a continuous probability distribution related to unknown population parameters. ![]() ![]() The Student’s t-distribution is widely applied for inferential statistics as it estimates for unknown parameters. Standard normal distribution vs t-distribution
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