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You plan to build a Confidence Interval to estimate the mean of a population for which the standard deviation is known to be 11.1. Find the minimum sample size needed to guarantee with 98% probability that your estimate is within Margin of Error 1.1 of the true population mean. Keep at least 4 decimal places in Zc to avoid rounding errors. Enter a whole number. Submit Question
1200 1040 1050 990 1070 1080 1090 1020 1020 1170 1120 1080 970 1090 1090 950 1140 960 850 1100 The SAT Exam is designed so that scores are normally distributed with mean score μ = 1000 and standard deviation a 100. = The table above shows a random sample of SAT scores from ACME High School a. Build a 94% CI for the population mean SAT score at ACME High School. Use a calculator/computer to build the CI, then round to two decimals and enter like this: (min,max). Be sure to include the parentheses or you will be marked wrong. b. Use your Cl to decide whether the mean score for ACME students differs from the national average. Yes, the mean at ACME probably is different since 1000 is not right in the middle of the Cl Yes, the mean at ACME is probably different since the Cl does not contain 1000 No, the mean at ACME is probably not different since 1000 is not close to either endpoint of the Cl O No, the mean at ACME is probably not different since the CI contains 1000 Submit Question