1. Please find the positive critical value which corresponds to a 90% confidence level. Remember, if the area is in between 2 z-scores, average the two z-scores.
2. 120 randomly selected airline travelers were asked if they rented a car when they reached their destination. 47 of those sampled rented a car when they arrived at their destination. Please find the point estimate, to three decimal places.
3. 425 randomly selected iPhones were tested. 10 were found to be defective. The 95% confidence interval estimate for the proportion of defective iPhones is between________ and ________. Please round to four decimal places.