someone measures the length of the 10 longest rivers in Europe. They then found the average length and sd and made a 95% confidence interval based on the normal curve for the average length of the longest rivers. Choose the most correct answer.

Choice 1 of 4: This is a reasonable approachChoice 2 of 4: They should have used the bootstrapChoice 3 of 4: This is not a random sample so we can't make confidence intervals.Choice 4 of 4: This is a census and we have observed the population parameter so we don't need to make a confidence interval