Question 1 > "You measure 50 watermelons' weights, and find they have a mean weight of 80 ounces. Assume the population standard deviation is 14.3 ounces. Based on this, construct a 90% confidence interval for the true population mean watermelon weight. Give your answers as decimals, to two places ounces Question Help: Video Submit Question. Question 10 In a some, 113- people were asked how much they spent on their child's last birthday gift. The results were roughly bell-shaped with a mean of 53? and standard deviation of 51!]. Find the margin of error at a 95% confidence level. Give your answer to two decimal places. Submit lQuest-ion Question 9 We wish to estimate what percent of adult residents in a certain county are parents. Out of 300 adult residents sampled, 282 had kids. Based on this, construct a 95% confidence interval for the proportion, p, of adult residents who are parents in this county. Give your answers as decimals, to three places.