Find out con?dence interval for the proportion

Reference no: EM13968639

1. According to Fortune, solar power now accounts for only 1% of total energy produced.15 If this number was obtained based on a random sample of 8,000 electricity users, give a 95% con?dence interval for the proportion of users of solar energy.

2. Money magazine is on a search for the indestructible suitcase.16 If in a test of the Helium Fusion Expandable Suiter, 85 suitcases out of a sample of 100 randomly tested survived rough handling at the airport, give a 90% con?dence interval for the population proportion of suitcases of this kind that would survive rough handling.

3. A machine produces safety devices for use in helicopters. A quality-control engineer regularly checks samples of the devices produced by the machine, and if too many of the devices are defective, the production process is stopped and the machine is readjusted. If a random sample of 52 devices yields 8 defectives, give a 98% con?dence interval for the proportion of defective devices made by this machine.

4. Before launching its Buyers' Assurance Program, American Express wanted to estimate the proportion of cardholders who would be interested in this automatic insurance coverage plan. A random sample of 250 American Express cardholders was selected and sent questionnaires. The results were that 121 people in the sample expressed interest in the plan. Give a 99% con?dence interval for the proportion of all interested American Express cardholders.

Reference no: EM13968639

Questions Cloud

What type of work schedule appeals to you : Cite examples of successful companies and the type of work schedules that they have (Yahoo vs. eBay). Will broadening job functions help increase/decrease employee productivity? Explain. What type of work schedule appeals to you

Develop a plan of action for the employee : What are at least 3 appraisal techniques that you would use to measure this employees performance?

Describe the mechanisms of fossil formation : Distinguish between the scientific and the colloquial use of the word "theory." Define evolution and indicate why it is viewed as controversial by non-scientists.

Complete analysis of the results : The values of these variables are (0, 0) for high technology industry, (0, 1) for biotechnology companies, and (1, 0) for aerospace ?rms. Following is part of the computer output for this analysis. Interpret the out- put, and give a complete analy..

Find out con?dence interval for the proportion : According to Fortune, solar power now accounts for only 1% of total energy produced.15 If this number was obtained based on a random sample of 8,000 electricity users, give a 95% con?dence interval for the proportion of users of solar energy.

Description of the benefits you believe the proposed idea : Include a description of the benefits you believe the proposed idea will bring to the organization. Your document must make it clear you are contacting the decision-maker to request permission to move forward with your research

Con?dence interval for proportion of ?lled mba : Assuming that these numbers are exact and that the sample was randomly chosen from the entire population of interest, give a 90% con?dence interval for the proportion of ?lled MBA positions in Europe.

Are the goals of the research clearly stated : Examine graphs and data tables, are there trends or results that you notice that are not mentioned in the text? Why not? Should they be? Would they change any of the conclusions or other statements the authors have made?

Con?dence interval for population proportion : According to BusinessWeek, many Japanese consider their cell phones toys rather than tools.14 If a random sample of 200 Japanese cell phone owners reveals that 80 of them consider their device a toy, calculate a 90% con?dence interval for the pop..

User Account

All Pages