Hi! To calculate the t-score for a 92% confidence interval with 21 data points (assuming normality), you'll need to follow these steps:
Step 1: Determine the degrees of freedom.
The degrees of freedom (df) = number of data points - 1 = 21 - 1 = 20.
Step 2: Identify the desired confidence level.
In this case, the desired confidence level is 92%.
Step 3: Consult a t-distribution table or use a t-distribution calculator.
Using a t-distribution table or calculator with the specified degrees of freedom (20) and desired confidence level (92%), you can find the corresponding t-score.
The t-score for a 92% confidence interval with 20 degrees of freedom is approximately 1.725.
Your answer: The t-score you would use to make a 92% confidence interval with 21 data points (assuming normality) is approximately 1.725.