Probability statistics | Mathematics homework help

7.9 Suppose that we will take a random sample of size n from a population having mean f-L and standard
deviation (J’. For each of the following situations, find the mean, variance, and standard deviation of
the sampling distribution of the sample mean x:
a f-L=1O, (J’=2, n=25 C f-L=3, (J’=.1, n=4
b u. = 500, (J’ = .5, n = 100 d u. = 100, (J’ = I, n = 1,600
7.10 For each situation in Exercise 7.9, find an interval that contains (approximately or exactly)
99.73 percent of all the possible sample means. In which cases must we assume that the population
is normally distributed? Why?
7.32 Again consider the survey of 350 Bank of America customers discussed in Exercise 7.31, and
assume that 48 of Bank of America customers would currently express customer delight. That
is, assume p = .48. Find:
a The probability that the sample proportion obtained from the sample of 350 Bank of America
customers would be within three percentage points of the population proportion. That is, find
P(.45 :::; p :::; .51).
b The probability that the sample proportion obtained from the sample of 350 Bank of America
customers would be within six percentage points of the population proportion. That is, find
P(.42 :::; p :::; .54).
7.33 Based on your results in Exercise 7.32, would it be reasonable to state that the survey’s “margin of
error” is ±3 percentage points? ±6 percentage points? Explain.

Order a unique copy of this paper
(550 words)

Approximate price: $22

Basic features
  • Free title page and bibliography
  • Unlimited revisions
  • Plagiarism-free guarantee
  • Money-back guarantee
  • 24/7 support
On-demand options
  • Writer’s samples
  • Part-by-part delivery
  • Overnight delivery
  • Copies of used sources
  • Expert Proofreading
Paper format
  • 275 words per page
  • 12 pt Arial/Times New Roman
  • Double line spacing
  • Any citation style (APA, MLA, Chicago/Turabian, Harvard)

Our guarantees

We are committed to making our customer experience enjoyable and that we are keen on creating conditions where our customers feel secured and respected in their interactions with us.
With our qualified expert team who are available 24/7, we ensure that all our customer needs and concerns are met..

Money-back guarantee

Our refund policy allows you to get your money back when you are eligible for a refund. In such a case, we guarantee that you will be paid back to your credit card. Another alternative we offer you is saving this money with us as a credit. Instead of processing the money back, keeping it with us would be an easier way to pay for next the orders you place

Read more

Zero-plagiarism guarantee

All orders you place on our website are written from scratch. Our expert team ensures that they exercise professionalism, the laid down guidelines and ethical considerations which only allows crediting or acknowledging any information borrowed from scholarly sources by citing. In cases where plagiarism is confirmed, then the costumier to a full refund or a free paper revision depending on the customer’s request..

Read more

Free-revision policy

Quality is all our company is about and we make sure we hire the most qualified writers with outstanding academic qualifications in every field. To receive free revision the Company requires that the Customer provide the request within fourteen (14) days from the first completion date and within a period of thirty (30) days for dissertations.

Read more

Privacy policy

We understand that students are not allowed to seek help on their projects, papers and assignments from online writing services. We therefore strive to uphold the confidentiality that every student is entitled to. We will not share your personal information elsewhere. You are further guaranteed the full rights of originality and ownership for your paper once its finished.

Read more

Fair-cooperation guarantee

By placing an order with us, you agree to the service we provide. We will endear to do all that it takes to deliver a comprehensive paper as per your requirements. We also count on your cooperation to ensure that we deliver on this mandate.

Read more

Calculate the price of your order

550 words
We'll send you the first draft for approval by September 11, 2018 at 10:52 AM
Total price:
The price is based on these factors:
Academic level
Number of pages