Suppose the mean height in inches of all 9th grade students at one high school is estimated. The population standard deviation is 3 inches. The heights of 10 randomly selected students are 73, 71, 61, 69, 74, 70, 75, 70, 72 and 62. * = Ex: 12.34 Margin of error at 99% confidence level = Ex: 1.23 99% confidence interval = [Ex: 12.34 Ex: 12.34] [smaller value, larger value]
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- Suppose the mean height in inches of all 9th grade students at one high school is estimated. The population standard deviation is 5 inches. The heights of 9 randomly selected students are 69, 69, 61, 66, 62, 71, 69, 72 and 65. * = Ex: 12.3o Margin of error at 99% confidence level = Ex: 1.23 99% confidence interval = [ Ex: 12.34 Ex: 12.34 ] [smaller value, larger value] 1Suppose the mean height in inches of all 9th grade students at one high school is estimated. The population standard deviation is 5 inches. The heights of 7 randomly selected students are 73, 70, 60, 71, 62, 72 and 67. X̄ = Margin of error @95% confidence level = 95% Confidence interval =Suppose the mean height in inches of all 9th grade students at one high school is estimated. The population standard deviation is 4 inches. The heights of 6 randomly selected students are 69, 62, 68, 64, 61 and 68. x¯ = Margin of error at 99% confidence level = 99% confidence interval = [ , ]
- Suppose the mean height in inches of all 9th-grade students at one high school is estimated. the population's standard deviation is 3 inches. the heights of eight randomly selected students are, 74, 73 61,63,68,75,65 and 63. x̅ = ? margin of error at 90% confidence level = ? 90 percent confidence interval = ?_?Suppose the mean height in inches of all 9th grade students at one high school is estimated. The population standard deviation is 2 inches. The heights of 9 randomly selected students are 66, 61, 75, 62, 61, 70, 65, 62 and 61. * = Ex: 12.34 Margin of error at 90% confidence level = Ex: 1.23 90% confidence interval = [Ex: 12.34 Ex: 12.34] [smaller value, larger value] Check Next 2The distance a basketball player runs during a game is one of the many variables used for assessing the performance of the players. 72 players are followed for a game each and the average distance ran by them is found to be 3494 meters (m) with a standard deviation of 133 m. Then the lower limit for the 95% confidence interval for the true mean is and the upper limit is ious NEXT Save
- Dr. Moore wanted to estimate the mean cholesterol level for all adult men living in Hartford. He took a sample of 25 adult men from Hartford and found that the mean cholesterol level for this sample is 186 mg/dL with a standard deviation of 12 mg/dL. Assume that the cho- lesterol levels for all adult men in Hartford are (approximately) normally distributed. Con- struct a 95% confidence interval for the population mean u.Suppose the mean height in inches of all 9th-grade students at one high school is estimated. The population standard deviation is 4 inches. The heights of 9 randomly selected students are 62, 74, 60, 75, 73, 71, 61, 71, and 67. x¯ = Margin of error at 90% confidence level = 90% confidence interval = [ , ]The distribution of study times for first-year students follows a normal distribution with a standard deviation = 45 minutes. Suppose a sample of 486 students found that the mean study for these students was =180 minutes per week. Use this to find a 95% confidence interval to estimate the mean study time for all students. We are 95% confident that the mean study time for first-year students is between