Purchase Solution

Sample size for the estimation of mean

Not what you're looking for?

Ask Custom Question

A consumer agency has retained an independet testing firm to examine a television manufacturer's claim that its 25-inch console lmodel consumes just 110 watts of electricity. Based on a preliminary study, the population standard deviation has been estimated as 11.2 watts for these sets. In undertaking a larger study, and using a simple random sample, how many sets must be tested for the firm to be 95% confident that its sample mean does not differ from the actual population mean by more than 3.0 watts?

2. For each of the following pairs of null and alternative hypotheses, determine whether the pair would be appropriate for a hypothesis test. If a pair is deemed inappropriate explain why?
a. Ho:II>0.30, H1:II<0.35
b. Ho:II= 0.72 H1:II=0.72
c. HO:II < 0.25 H1: II > 0.25
d. Ho: II > 0.48 H1: II > 0.48
e. Ho: II < 0.70 h1: II > 0.70
f. Ho:p > 0.65 H1:p < 0.65

Purchase this Solution

Solution Summary

The solution provides step by step method for the calculation of sample size for the estimation of mean . Formula for the calculation and Interpretations of the results are also included.

Purchase this Solution


Free BrainMass Quizzes
Measures of Central Tendency

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

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.

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.

Terms and Definitions for Statistics

This quiz covers basic terms and definitions of statistics.