Purchase Solution

Tes the claim that the lifetime of the batteries is at least 30 months.

Not what you're looking for?

Ask Custom Question

The manufacturer of batteries for aircraft emergency vehicles claims that lifetime of the 1500 batteries that have been manufactured is normally distributed with a mean of at least 30 months and a standard deviation of 3 months. An aircraft manufacturer checks out 25 batteries that they purchased and discovers a sample mean of 29 months.

Please use the attachments provided and not only excel functions.

[See the attached Question File.]

Purchase this Solution
Solution Summary

This solution uses the t statistic to test the hypothesis and show the p value is greater that 0.5.

Solution Preview

n = 25, x-bar = 29, sigma = 3, mu = 30; Let alpha = 0.05

t = (x-bar - ...

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.

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.

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.

View More Free Quizzes
Related BrainMass Solutions

  • T-Test for Mean Lifetime of its Lithium Batteries is 1400 Hours

    596503 T-Test for Mean Lifetime of Lithium Batteries There will be at least one question of this type on my final exam tomorrow and I need a logical way to approach the solution.

  • Determining Battery Lifetime Using Normal Distribution

    Assuming the lifetime of the batteries is normally distributed, determine the number of days that at least 95% of the batteries will last beyond. Since the lifetime of the batteries is normally distributed, by question, we have P(Z>z)=1-0.95=0.05.

  • Statistics - Confidence Intervals explained in this solution

    Based on this sample, find a 90% confidence interval for the true mean lifetime of all batteries of this brand. Then complete the table below. Carry your intermediate computations to at least three decimal places.

  • Statistics - Perform a two-tailed test

    p-value (round to at least three decimal places): Look at z table. the p value is 0.0175 Can we conclude that the mean lifetime of light bulbs made by this manufacturer differs from 51 months?

  • Confidence Intervals an Hypothesis Tests for Mean

    To support this claim, the company publishes an ad reporting the results of a recent experiment showing that under normal usage, their batteries last at least 35 hours.

  • Testing of Hypothesis

    What is the ? A manufacturer claims that the mean lifetime, , of its light bulbs is months. The standard deviation of these lifetimes is months. Eighty bulbs are selected at random, and their mean lifetime is found to be months.

  • Confidence Interval & Sample Size

    302496 Confidence Interval (1) The lifetime of a certain brand of battery is known to have a standard deviation of 19.8 hours. Suppose that a random sample of 50 such batteries has a mean lifetime of 40.9 hours.

  • Test of hypothesis-Z statistic and p-value

    (rounded to at least 3 decimal places) Can we conclude that the mean life time average differs from 52 months A manufacturer claims that the mean lifetime, mean, of its light bulbs is 52 months.

  • Chebyshev's theorem

    To investigate its new line of Ultra batteries, BIG randomly selects 1000 Ultra batteries and finds that they have a mean lifetime of 919 hours. Suppose that this mean applies to the population of all Ultra batteries.

View More Related Solutions