Free up your time by getting your academic assignments done faster- without compromising on quality!

Custom Academic Papers

100% Original, Plagiarism Free, Customized to your instructions!

How It WorksOrder Now

STATISTICS

6. The standard deviation of test scores on a certain achievement test is 11.5. A random sample of 90 scores on this test had a mean of 75.3. Based on this sample, find a 90% confidence interval for the true mean of all scores. Then give its lower limit and upper limit.Carry your intermediate computations to at least three decimal places. Round your answers to one decimal place. (If necessary, consult a list of formulas.)Lower limit:Upper limit:   7. A psychologist is studying the self image of smokers, which she measures by the self-image (SI) score from a personality inventory. She would like to estimate the mean SI score, ?, for the population of all smokers. She plans to take a random sample of SI scores for smokers and estimate ? via this sample. Assuming that the standard deviation of SI scores for the population of all smokers is 90, what is the minimum sample size needed for the psychologist to be 99% confident that her estimate is within 10 of ??Carry your intermediate computations to at least three decimal places. Write your answer as a whole number (and make sure that it is the minimum whole number that satisfies the requirements).(If necessary, consult a list of formulas.)   

8. Do pregnant women give birth the week of their due date? A study claims that 12% of the population of all pregnant women actually gave birth the week of their due date. You are a researcher who wants to test this claim, so you will select a random sample of 60 women who have recently given birth.Follow the steps below to construct a 95% confidence interval for the population proportion of all pregnant women who gave birth the week of their due date. Then state whether the confidence interval you construct contradicts the study’s claim. (If necessary, consult a list of formulas.)(a)Click on “Take Sample” to see the results from the random sample.  Take SampleNumberProportionGave birth the week of due dateDid not give birth the week of due dateEnter the values of the sample size, the point estimate of the population proportion, and the critical value you need for your 95% confidence interval. (Choose the correct critical value from the table of critical values provided.) When you are done, select “Compute”.Critical values=z0.0052.576=z0.0102.326=z0.0251.960=z0.0501.645=z0.1001.282Sample size: Point estimate: Critical value: ComputeStandard error: Margin of error: 95% confidence interval:     (b)Based on your sample, graph the 95% confidence interval for the population proportion of all pregnant women who gave birth the week of their due date.

Hire your personal Essay Writer TODAY!

Get 20% off on your first two Orders this week.

Why Choose Us?

Frequently Asked Questions

9

Qualified Writers

Each paper writer passes a series of grammar and vocabulary tests before joining our team.
9

Anonymity

We care about the privacy of our clients and will never share your personal information with any third parties or persons.
9

Free Turnitin Report

A plagiarism report from Turnitin can be attached to your order to ensure your paper’s originality.
9

24/7/365 Support

You can contact us any time of day and night with any questions; we’ll always be happy to help you out.

Will your essay writers follow my paper instructions?

Yes, absolutely! When you make your first sign-up, you get a personal cabinet for your comprehensive experience.

You will be able to provide the instructions or attach files directly to the order.

Additionally, you will be able to chat with your essay writer and discuss any specific details or ask any questions.

How are you going to make sure that my essay is plagiarism-free?

We guarantee the originality of all our papers and have a zero-tolerance policy towards plagiarism.

We can provide you with a free plagiarism report from Turnitin (upon request).

How fast can you write my essay?

The minimum deadline is 3 hours, but if your assignment isn’t complicated, we may be able to adjust to your time-frame needs. Simply give us a deadline, and we’ll get it done.

We also offer discounts depending on the urgency of your assignment. The further your deadline, the lower the price per page will be.

If you write my paper and it has some issues, what should I do?

First of all, we will do our best to ensure that everything goes well.

If something needs to be changed/fixed/amended, we will revise your paper an unlimited number of times, free of charge, until you are satisfied with the results.

We also provide 24/7 support to assist you whenever you need it!

How does your essay writing service process payments?

We are certified by PayPal, Visa, Mastercard, American Express, and Discover. Furthermore, we process all payments a secure gateway, which ensures complete security and privacy of your data when you pay for an essay.

Does your paper writing service have any features?

Sure thing, we do!

When you order essays from our essay writing service, you get the following features for free:

• Plagiarism report
• Personal chat with paper writer
• Unlimited Revisions
• Title Page
• Formatting
• Best writer
• Outline