Purchase Solution

# Confidence Intervals

Not what you're looking for?

Tesla Motors needs to buy axles for their new car. They are considering using Chris Cross Manufacturing as a vendor. A random sample of 250 axles yields 240 that met Tesla's specifications.

a) Determine the 99% confidence interval for the population proportion of criss cross axles that meet Tesla's specifications.

b) Interpret this interval.

c) How many axles should be tested to generate a 99% confidence interval with an error margin of 1.5%?

##### Solution Summary

This solution is comprised of detailed step-by-step calculation of the given problem and provides students with a clear perspective of the underlying concept.

##### Solution Preview

Solution:

a) The confidence interval for proportion is given as
p±zα2 p1−pn
where, p represents the proportion of success=240250=0.96
n represents sample size=250
Zα2for 99% confidence ...

##### Free BrainMass Quizzes

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

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.

##### Terms and Definitions for Statistics

This quiz covers basic terms and definitions of statistics.