The formula will also be in your class notes and textbook. Please show what you've tried and say where you get stuck.
No matter how I approach it..i don't get it!
A recent study of 25 students reported that they spend an average of $18.53 per week on gas. The standard deviation of the sample was $3.00. Find the 95% confidence interval of the true mean.
where is the population SD, is the population mean, is the sample size,
is the sample mean and is the sample SD.
The 95% interval ranges from 2.5% to 97.5%.
Locate the Z-score for 97.5% and use the values given to rearrange the equation for