1-20chapter stats

Calculate a 91 confidence interval for the mean

Info iconThis preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: ounces. Construct a 99% confidence interval for the true machine-fill amount. A. [5.888 5.972] B. [5.814 6.046] C. [5.716 6.144] D. [5.824 6.036] E. [5.796 6.064] AACSB: Analytic Bloom's: Application Difficulty: Medium Topic: Confidence interval for population mean σ unknown 57. The coffee/soup machine at the local bus station is supposed to fill cups with 6 ounces of soup. Ten cups of soup are brought with results of a mean of 5.93 ounces and a standard deviation of 0.13 ounces. How large a sample of soups would we need to be 95% confident that the sample mean is within 0.03 ounces of the population mean? A. 97 B. 96 C. 73 D. 62 E. 10 AACSB: Analytic Bloom's: Application Difficulty: Hard Topic: Sample size determination for population mean 1-671 Chapter 01 - An Introduction to Business Statistics 58. A local company makes a candy that is supposed to weigh 1.00 ounces. A random sample of 25 pieces of candy produces a mean of 0.996 ounces with a standard deviation of 0.004 ounces. Construct a 98% confidence interval for the mean weight of all such candy. A. [0.9645 1.0275] B. [0.9956 0.9964] C. [0.9860 1.0060] D. [0.9940 0.9980] E. [0.9942 0.9978] AACSB: Analytic Bloom's: Application Difficulty: Hard Topic: Confidence interval for population mean σ unknown 59. A local company makes a candy that is supposed to weigh 1.00 ounces. A random sample of 25 pieces of candy produces a mean of 0.996 ounces with a standard deviation of 0.004 ounces. How many pieces of candy must we sample if we want to be 99% confident that the sample mean is within 0.001 ounces of the true mean? A. 126 B. 124 C. 107 D. 12 E. 6 AACSB: Analytic Bloom's: Application Difficulty: Medium Topic: Sample size determination for population mean 1-672 Chapter 01 - An Introduction to Business Statistics 60. An environmental group at a local college is conducting independent tests to determine the distance a particular make of automobile will travel while consuming only 1 gallon of gas. A sample of five cars is tested and a mean of 28.2 miles is obtained. Assuming that the standard deviation is 2.7 miles, find the 95% confidence interval for the mean distance traveled by all such cars using 1 gallon of gas. A. [26.16 30.24] B. [20.70 35.70] C. [24.85 31.55] D. [26.70 29.70] E. [25.83 30.57] AACSB: Analytic Bloom's: Application Difficulty: Medium Topic: Confidence interval for population mean σ known 61. An environmental group at a local college is conducting independent tests to determine the distance a particular make of automobile will travel while consuming only 1 gallon of gas. A sample of five cars is tested and a mean of 28.2 miles is obtained. How many cars should the environmental group test if they wish to estimate µ, mean miles per 1 gallon, to within 0.5 miles and be 99% confident? Assume a population standard deviation of 2.7 miles. A. 25 B. 124 C. 194 D. 618 E. 619 AACSB: Analytic Bloom's: Application Difficulty: Medium Topic: Sample size determination for population mean 1-673 Chapter 01 - An Introduction to Business Statistics 62. A sociologist develops a test designed to measure a person's attitudes about disabled people, and 16 randomly selected subjects are given the test. Their mean score is 71.2 with a standard deviation of 10.5. Construct the 99% confidence interval for the mean score of all subjects. A. [40.26 102.14] B. [63.46 78.94] C. [60.66 81.74] D. [64.44 77.96] E. [63.21 79.19] AACSB: Analytic Bloom's: Application Difficulty: Medium Topic: Confidence interval for population mean σ unknown 63. There is an average of 22.455 employees at 22 office furniture dealers in a major metropolitan area with a standard deviation of 18.52. Construct a 99% confidence interval for the true mean number of full-time employees at office furniture dealers. A. [11.014 33.896] B. [11.277 33.633] C. [12.284 32.626] D. [12.513 32.397] E. [20.072 24.838] AACSB: Analytic Bloom's: Application Difficulty: Medium Topic: Confidence interval for population mean σ unknown 1-674 Chapter 01 - An Introduction to Business Statistics 64. A federal bank examiner is interested in estimating the mean outstanding defaulted loans balance of all defaulted loans over the last three years. A random sample of 20 defaulted loans yielded a mean of $67,918 with a standard deviation of $16,552.40. Calculate a 90% confidence interval for the mean balance of defaulted loans over the past three years. A. [66,487 69,349] B. [39,299 96,537] C. [57,329 78,507] D. [61,829 74,007] E. [61,519 74,317] AACSB: Analytic Bloom's: Application Difficulty: Medium Topic: Confidence interval for population mean σ unknown 65. An experiment was conducted to determine the effectiveness of a method designed to remove oil wastes found in soil. Three contaminated soil samples were treated. After 95 days, the percentage of contamination removed from each soil sample was measured with a mean of 49.3% and a standard deviation of 1.5%. Estimate the mean percentage of contamination removed at a 98% confi...
View Full Document

This document was uploaded on 01/20/2014.

Ask a homework question - tutors are online