Question on hypothesis testing for means

Assignment Help Basic Statistics
Reference no: EM13111123

The breaking strengths of cables produced by a certain manufacturer have a mean, of 1925 pounds, and a standard deviation of 65 pounds. It is claimed that an improvement in the manufacturing process has increased the mean breaking strength. To evaluate this claim, 50 newly manufactured cables are randomly chosen and tested, and their mean breaking strength is found to be 1931pounds. Can we support, at the 0.05 level of significance, the claim that the mean breaking strength has increased? (Assume that the standard deviation has not changed.) Perform a one-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.

Answer the following:

Hypothesis:

1)H0

2)H1

3) The type of test

A) T test

b) f test

c) Chi square

d) Z

4)The value of the test statistic

Round to 3 decimal places

5) The P value

Round to 3 decimal places

6) Can we support the claim that the mean breaking strength has increased ?

Yes or no

Reference no: EM13111123

Questions Cloud

Develop a plan for bringing about corporate responsibility : At the conclusion of your points, develop a short, impassioned speech you would give to people to back your ideas. Comprise proper in-text citations in APA format to support your answer.
Calculating expected values : The following is a payoff table giving profits for various situations. States of Nature Alternatives A B C Alternative 1 100 120 180 Alternative 2 120 140 120 Alternative 3 200 100 50
When an insider releases material insider information : When an insider releases material insider information to a non-insider tippee the tipper is liable for- A) The tipper's own trading only.
Illustrate what is the organization''s current profit : At the market price of $12.50 per unit the organization's marginal cost curve crosses the marginal revenue curve at an output level of 1000 units. Illustrate what is the organization's current profit? Illustrate what is likely to occur in this mar..
Question on hypothesis testing for means : The breaking strengths of cables produced by a certain manufacturer have a mean, of 1925 pounds, and a standard deviation of 65 pounds. It is claimed that an improvement in the manufacturing process has increased the mean breaking strength.
Determine best fit to perform analysis : You have got the following data and are going to perform regression analysis. Under line of best fit to perform this analysis? Compute the R? What kind of relationship does it signify (strong/weak; positive/negative)?
Summarize the unique security challenges : Malpass International has been reliant on a legacy human resource management database for the past 12 years. Now, senior management has approved funds for a complete replacement.
Explain registration requirements of the 1933 securities act : American Insurance Corporation, Inc. sells various kinds of insurance products. American is considering taking numerous possible actions. Which of these actions should be subject to the registration requirements of the 1933 Securities Act?
Illustrate what general steps should hank follow in setting : Illustrate what general steps should Hank follow in setting up a continuous improvement program for the industry? Illustrate what problems will he have to overcome to make it work?

Reviews

Write a Review

 

Basic Statistics Questions & Answers

  Determining the standard error of mean

The sample mean and the standard deviation were determined to be 120 and 40 respectively. The standard error of the mean is?

  Affect the width of the confidence interval

If all the other quantities remain the same, how does the indicated change affect the width of the confidence interval?

  Fitting of orthogonal polynomial regression model

What conclusions can you draw about the nature of the relationship between anxiety and exam performance?

  Formulating suitable null and alternative hypothesis

Formulate a suitable null and alternative hypothesis to test the students' claim that they followed their instructor's recommendation at a 5% level of significance and interpret your findings.

  Hypothesis thinking in court system

In the North American court system, a defendant is assumed innocent until proven guilty. In an ideal world, we would expect that the truly innocent will always go free, whereas the truly guilty ones will always be convicted.

  Simple linear regression model problem

A fellow researcher fits a simple linear regression model Yi = α + βXi + ui by least squares, but has doubts that the first least squares assumption E(ui |Xi) = 0 is correct for her data set.

  Comparing relationship between variables

Which measure of association do you use to compare the relationship between these variables? Why?

  Work out the mean and the median

Consumer Review posts reviews and ratings of a variety of products on internet. The following is a sample of 20 speaker systems and their ratings (www.audioreviews.com).

  Number of shares held by stockholders

Identify the level of measurement (nominal, ordinal, interval, ratio) for the number of shares held by stockholders.

  Example of a two sample test for proportion or mean

Explain in your own words how to recognize a situation where you needed to use a two-sample test. Give a unique example of a two sample test for proportion or mean. Make sure to detail why only a two sample test would suffice.

  Frequency distribution to create a probability distribution

Use frequency distribution to create a probability distribution, determine the (b) mean,(c) variance.

  Uniform distribution over the interval

If we assume that the errors made by rounding off are iid and have a uniform distribution over the interval ( - ~, ~), compute approximately the probability that the sum of the integers is within two units of the true sum.

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