8 min read
This study guide covers confidence intervals for means using the t-distribution. It includes the t-distribution, degrees of freedom, and comparing the t-distribution to the normal distribution. It also explains the conditions for inference, the confidence interval formula (point estimate ± margin of error), and how to interpret confidence intervals. Finally, it provides practice questions and key exam tips.
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Question 1 of 11
When is the t-distribution primarily used instead of the normal distribution? 🤔
When the population standard deviation () is known
When the sample size is very large (e.g., n > 100)
When the population standard deviation () is unknown
When dealing with categorical data