Purchase Solution

Confidence Interval and Sample Size

Not what you're looking for?

Ask Custom Question

1. A consumer group would like to estimate the average amount of P G and E bill for the month of March for single family homes in the San Francisco Bay area. Based on studies conducted in other similar climate cities, the standard deviation is assumed to be $25. The group would like to estimate the average March bill to be within 5 of the population average with 95% level confidence.

Find the sample size needed.
a) 166
b) 97
c) 158

2. If the confidence level is increased to 99%, would the sample size needed increase or decrease? What would it be?
a) 166
b) 97
c) 158

Purchase this Solution

Solution Summary

This solution is comprised of detailed step-by-step calculations and analysis of the given problems related to Confidence Interval and Sample Size and provides students with a clear perspective of these topics.

Solution provided by:
Education
  • MSc, Osmania University
  • MSc, Indian Institute of Technology - Roorkee (I.I.T.-ROORKEE)
  • BSc, Banaras Hindu University
Recent Feedback
  • "Very fast turnaround. Excellent communication! Much appreciated!"
  • "excellent"
  • "excellent"
  • "excellent work"
  • "Fantastic..great solution and very well explained!!!!"
Purchase this Solution


Free BrainMass Quizzes
Terms and Definitions for Statistics

This quiz covers basic terms and definitions of statistics.

Know Your Statistical Concepts

Each question is a choice-summary multiple choice question that presents you with a statistical concept and then 4 numbered statements. You must decide which (if any) of the numbered statements is/are true as they relate to the statistical concept.

Measures of Central Tendency

This quiz evaluates the students understanding of the measures of central tendency seen in statistics. This quiz is specifically designed to incorporate the measures of central tendency as they relate to psychological research.

Measures of Central Tendency

Tests knowledge of the three main measures of central tendency, including some simple calculation questions.