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A sample of 67 night-school students' ages is obtained in order to estimate the mean age...
2. A sample of 60 night school students had an average age of 25.3 years. Use...
2. A sample of 60 night school students had an average age of 25.3 years. Use this information and a population variance of 16 to find a a. 95% confidence interval estimate for the population mean (2 pts) b. 99% confidence interval estimate for the population mean (2 pts) c. Redo part a) assuming 16 is the sample variance. (2 pts)
A college admissions director wishes to estimate the mean age of all students currently enrolled. In...
A college admissions director wishes to estimate the mean age of all students currently enrolled. In a random sample of 16 students, the mean age is found to be 21.8 years. From past studies, the ages of enrolled students are normally distributed with a standard deviation of 10.1 years. Construct a 90% confidence interval for the mean age of all students currently enrolled. 1. The critical value: 2. The standard deviation of the sample mean: 3. The margin of error:...
A college admissions director wishes to estimate the mean age of all students currently enrolled. In...
A college admissions director wishes to estimate the mean age of all students currently enrolled. In a random sample of 24 students, the mean age is found to be 23.1 years. From past studies, the ages of enrolled students are normally distributed with a standard deviation of 10.6 years. Construct a 90% confidence interval for the mean age of all students currently enrolled. 1. The critical value: 2. The standard deviation of the sample mean: 3. The margin of error:...
A machine produces parts with lengths that are normally distributed with σ = 0.6. A sample...
A machine produces parts with lengths that are normally distributed with σ = 0.6. A sample of 19 parts has a mean length of 75.28. (a) Give a point estimate for μ. (Give your answer correct to two decimal places.) (b) Find the 98% confidence maximum error of estimate for μ. (Give your answer correct to three decimal places.) (c) Find the 98% confidence interval for μ. (Give your answer correct to three decimal places.) Lower Limit Upper Limit You...
A machine produces parts with lengths that are normally distributed with σ = 0.69. A sample...
A machine produces parts with lengths that are normally distributed with σ = 0.69. A sample of 19 parts has a mean length of 76.89. (a) Give a point estimate for μ. (Give your answer correct to two decimal places.) (b) Find the 98% confidence maximum error of estimate for μ. (Give your answer correct to three decimal places.) (c) Find the 98% confidence interval for μ. (Give your answer correct to three decimal places.) Lower Limit ______ Upper Limit...
The President of school wants to know the ages of Math students at school. He wants...
The President of school wants to know the ages of Math students at school. He wants a range for the ages. Construct a 99% confidence interval for the population mean age. Ages (years) 31 30 21 20 44 43 23 25 30 28 19 21 21 37 26 20 19 22 28 40 20 48 19 20 36 20 20 19 19 21 47 19 21 19 17 19 20 20 32 23 18 21 22 20 19 35 21...
Current Attempt in Progress Construct 90%, 95%, and 99% confidence intervals to estimate μ from the...
Current Attempt in Progress Construct 90%, 95%, and 99% confidence intervals to estimate μ from the following data. State the point estimate. Assume the data come from a normally distributed population. 13.3 11.6 11.9 13.1 12.5 11.4 12.0 11.7 11.8 13.3 Appendix A Statistical Tables (Round the intermediate values to 4 decimal places. Round your answers to 2 decimal places.) 90% confidence interval: enter the lower limit of the 90% confidence interval ≤ μ ≤ enter the upper limit of the...
We selected a random sample of 100 StatCrunchU students, 67 females and 33 males, and analyzed...
We selected a random sample of 100 StatCrunchU students, 67 females and 33 males, and analyzed their responses to the question, "What is the total amount (in dollars) of credit card debt you have accrued to date?" With more than 30 in each random and independent sample, conditions are met for modeling the distribution of differences in sample means using a T-model. Therefore, we will proceed with finding a confidence interval to estimate the gender difference in credit card debt...
A machine produces parts with lengths that are normally distributed with σ = 0.55. A sample...
A machine produces parts with lengths that are normally distributed with σ = 0.55. A sample of 20 parts has a mean length of 76.47. (a) Give a point estimate for μ. (Give your answer correct to two decimal places.) (b) Find the 90% confidence maximum error of estimate for μ. (Give your answer correct to three decimal places.) (c) Find the 90% confidence interval for μ. (Give your answer correct to three decimal places.) Lower Limit - Upper Limit...
In a sample of 55 randomly selected students, 24 favored the amount being budgeted for next...
In a sample of 55 randomly selected students, 24 favored the amount being budgeted for next year's intramural and interscholastic sports. Construct a 90% confidence interval for the proportion of all students who support the proposed budget amount. (Give your answers correct to three decimal places.) Lower Limit Upper Limit You may need to use the appropriate table in Appendix B to answer this question.
2. A sample of 60 night school students had an average age of 25.3 years. Use this information and a population variance of 16 to find a a. 95% confidence interval estimate for the population mean (2 pts) b. 99% confidence interval estimate for the population mean (2 pts) c. Redo part a) assuming 16 is the sample variance. (2 pts)
In a sample of 55 randomly selected students, 24 favored the amount being budgeted for next year's intramural and interscholastic sports. Construct a 90% confidence interval for the proportion of all students who support the proposed budget amount. (Give your answers correct to three decimal places.) Lower Limit Upper Limit You may need to use the appropriate table in Appendix B to answer this question.
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