In 2018 a random sample of 100 American families found an average balance in their savings accounts was $450 (standard deviation = $200)

1. Provide a 90% confidence interval of the true average savings account balance among all American families.Be sure to present your interval in this form:number <= parameter <= number. Your parameter should include the proper notation.
2. What is the probability that the true average savings account balance among all American families falls outside of your interval? Fill in the blank:The probability that the true average savings account balance among all American families falls outside of the interval is ______.
3. If Problem 1 had asked for a 94% confidence interval, what critical value would you have used?

Fill in the blank:The critical value that I would have used is ____________________.