Find mean lifetime of light bulbs by manufacturer differ

Assignment Help Basic Statistics
Reference no: EM13147607

A manufacturer claims that the mean lifetime of its light bulbs is 55 months. The standard deviation of these lifetimes is 6 months. Twenty-two bulbs are selected at random, and their mean lifetime is found to be 56 months. Assume that the population is normally distributed. Can we conclude, at the 0.05 level of significance, that the mean lifetime of light bulbs made by this manufacturer differs from 55 months?

Perform a two-tailed test. Then fill in the table below.

Carry your intermediate computations to at least three decimal places, and round your responses as specified in the table. (If necessary, consult a list of formulas.)
Please answer:
Ho=
H1=
Type of test?
The values of the test statistic?
The two critical values at the 0.05 level of significance?
Can we conclude that the mean lifetime of light bulbs made here differs from 55 months?

Reference no: EM13147607

Use of chi-square tests using contingency tables

What are some real life examples of the use of Chi-Square tests using contingency tables? Why is a test, which is testing significant differences among means called Analysis o

Mean amount people spend at a popular coffee shop

A research firm conducted a survey to determine the mean amount people spend at a popular coffee shop during a week. They found the amounts spent per week followed a normal

Find the critical value corresponding to a sample size

Find the critical value for zα/2 that corresponds to a degree of confidence of 98% - Find the critical value for tα/2 corresponding to n = 12 and 95% confidence level.

Self esteem scores of a sample of statistics students

We measure the self esteem scores of a sample of statistics students, reasoning that this course may lower their self esteem relative to that of the typical college student

Find the joint probability function of y1 and y2

Three of the executives are to be selected for promotion. Let Y1 denote the number of married executives and Y2 denote the number of never-married executives among the three

Rejection rule for the null hypothesis

State the rejection rule for the null hypothesis using the "critical value method to test hypothesis". State the rejection rule for the null hypothesis using the "p-value meth

The horticulture research international-east manning

In 1997, scientists at the Horticulture Research International-East Manning conducted an exploratory study to assess the potential impact of RSS. The results of this investi

What would be an appropriate random variable

The main switchboard at the Home Shopping Network receives calls from customers. If the Poisson distribution were applied to this process, what would be an appropriate rando

Reviews

Write a Review

 
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd