Purchase Solution

Confidence interval for proportion

Not what you're looking for?

Ask Custom Question

Please help with the following problems involving confidence intervals.

1. Find the point estimate p-hat and the margin of error for the confidence interval (0.444, 0.484)
2 With destructive testing, sample items are destroyed in the process of testing them. Crash testing of cars is one very expensive example of destructive testing. Twelve Dodge Viper sports cars (list price: $59,300) are crash tested under a variety of conditions that simulate typical collisions. Analysis of the 12 damaged cars results in repair costs having a distribution that appears to be bell-shaped, with a mean of x-bar = $26,227 and a standard deviation of s = $15, 873 (based on data from the Highway Loss Data Institute). Find the 95% interval estimate of m, the mean repair cost for all Dodge Vipers involved in collisions, and interpret the result.

Purchase this Solution

Solution Summary

This solution gives the step by step method for computing confidence interval for population proportions.

Solution Preview

Please see the attachments.
Calculations are done in Excel.

Confidence Interval Estimate for the ...

Purchase this Solution


Free BrainMass Quizzes
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.

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.