Math -225n Week 5 Confidence Interval For Mean Quiz

This study source was downloaded by 100000802832151 from CourseHero.com on 11-07-2022 10:20:59 GMT -06:00https://www.coursehero.com/file/58618508/Confidence-Interval-for-Mean-week5docx/ Confidence Interval for Mean - Population Standard Deviation Known week 61. Suppose the germination periods, in days, for grass seed are normally distributed. If the population standard deviation is 3 days, what minimum sample size is needed to be 90 % confident that the sample mean is within 1 day of the true population mean?25 seeds2. The length, in words, of the essays written for a contest are normally distributed with a population standard deviation of 442 words and an unknown population mean. If a random sample of 24 essays is taken and results in a sample mean of 1330 words, find a 99 % confidence interval for the population mean.Answer: Lower limit = 1097.59 upper Limit = 1562.413. The lengths, in inches, of adult corn snakes are normally distributed with a population standard deviation of 8 inches and an unknown populationThis study source was downloaded by 100000802832151 from CourseHero.com on 11-07-2022 10:20:59 GMT -06:00https://www.coursehero.com/file/58618508/Confidence-Interval-for-Mean-week5docx/mean. A random sample of 25 snakes is taken and results in a sample mean of 58 inches.Identify the parameters needed to calculate a confidence interval at the 99 % confidence level.