Math 115-01: Introductory Statistics Wheeling University - Fall 2022 You want to obtain a sample to estimate a population proportion. You would like to be 97% confident that your estimate is within 3.5% of the true population proportion. How large of a sample size is required? (1 pt.) 19. You want to obtain a sample to estimate a population mean. Based on previous evidence you believe the population standard deviation is approximately 23.8. You would like to be 99% confident that your estimate is within 4 of the true population mean. How large of a sample size is required? (1 pt.) n = 20. A study was done asking people how much money they spend per month on their gas bill and how much money per month they spend on their electric bill. The correlation r ion r was found to be 0.94 and the p-value for correlation was 0.0003. Then a person with high natural gas bill will also have a high electric bill. (1 pt.) true false 21. The data below is 9 observations of car weight (x) and gas mileage (y). Calculate the linear correlation coefficient, r. Enter your answer to two decimal places. (1 pt.) X (tons) (mpg) 1.2 46 1.4 31 2.2 26 3 24 3.2 24 1.1 31 2.4 33 1.8 35 1.5 43 r =