solve 6 questions with step

Fall 2022
Written Assignment #2
due: Monday, November 14 at 4:30
This written assignment is to be submitted digitally to Crowdmark. Use .pdf, .jpg, or .png
formats for your assignment submissions.
. An email will be sent to your account to access Crowdmark.
. Login with your student account.
. For each question, upload an image or .pdf of your solution. Each question is to be
uploaded separately and each will accept multiple files.
. You can edit and change your answers until the due date.
. Please do not wait until the last minute to submit your assignment as unforeseen events
do occur.
1. A sociologist intends to estimate the percentage of adults who believe in astrology. How
many adults does the sociologist need to survey if a confidence level of 99% and a margin
error of 4% are desired
a) if nothing is known about the percentage to be estimated.
b) if a recent survey shows 16% of respondents say they believe in astrology.
2. This question will have you explore the effect of the sample size on the sampling distribution of the mean.
a) Open Excel. Select Data Analysis, then select “Random Number Generation” from
the available options. Use the following values when prompted to enter them:
• Parameters: Between 1 and 10
• Number of Variables: 6
• Output: New Worksheet Ply
• Number of Random Numbers: 50
• Distribution: Uniform
There will be 50 rows and 6 columns filled with numbers in a new Sheet on Excel.
Consider each row as a random sample drawn uniformly from the numbers 1 to 10. In
this case, you have 50 samples of size 6.
Skip the next column, and in the first empty cell of the following empty column, enter
a formula for the mean of the sample in the first row, then drag this formula down to
the last row. In this case, you should enter the formula
into cell H1. Dragging the formula down from cell H1 to H50 finds the remaining
sample means.
b) Create a histogram for the sampling distribution of the mean using the upper class
limits 1, 2, 3, . . . , 10. Edit the chart so that it reads “Created by hYour Namei” as the
title. Rename the “Bin” column so that it includes lower and upper class limits (make
the entries 0 to 1, 1.001 to 2, 2.001 to 3, 3.001 to 4, and so on). Set the gap width to
0%. Submit a screenshot of the histogram with its frequency distribution
table. You can refer to the document “Excel Commands” on Brightspace or refer to
your Written Assignment #1 if you need a reminder on creating histograms.
Fall 2022
c) Repeat a) and b) with Number of Variables as 20 instead of 6.
d) How does the sampling distribution of the mean change as the sample size increases?
3. A randomly selected group of 12 adults participated in a sleep study. The mean number of
hours slept was x = 6.8 hours. The number of hours slept by adults seems to be normally
distributed with mean 7 hours and standard deviation 2 hours.
a) Describe the sampling distribution of the sample mean x.
b) What is the probability of drawing a sample of 12 adults with a mean of 6.8 hours of
sleep or less? Give your answer as a percentage rounded to 3 decimal places.
4. In a random sample of 1480 adults, 455 of the respondents have sleepwalked.
a) Let p represent the proportion of all adults who have sleepwalked. Find a point estimate
for p rounded to 3 decimals places.
b) Find 90% and 99% confidence intervals for p, again rounded to 3 decimal places.
c) Using your 99% confidence interval from part b), make a conclusion about the results
of drawing the sample.
d) Describe what happens to the width of the confidence interval as the level of confidence
5. A group of 6 students are asked to estimate the length of one minute without reference
to any timers. The times they provided (in seconds) are given below:
Assuming the population is approximately normal and using a 0.10 significance level, test
the claim that these provided times are indeed from a population with mean 60 seconds.
a) State the null and alternative hypotheses.
b) Calculate the test statistic (round it to 3 decimal places).
c) Find the critical value (round it to 3 decimal places).
d) Make a conclusion based on your answers in parts b) and c). Do the results indicate
that students are reasonably good at estimating the length of one minute?
6. A researcher claims that the mean SAT score is greater than 515. A sample of 1800
students shows the sample mean SAT score is 519 with standard deviation 111. Test the
researcher’s claim using a 0.05 significance level.
a) State the null and alternative hypotheses.
b) Calculate the test statistic (round it to 3 decimal places).
c) Find the P -value (round it to 3 decimal places).
d) Make a conclusion based on your answers in parts b) and c).
e) Explain what would constitute a Type I error in this context.
f) Explain what would constitute a Type II error in this context.

Don't use plagiarized sources. Get Your Custom Essay on
solve 6 questions with step
Just from $13/Page
Order Essay
Achiever Essays
Calculate your paper price
Pages (550 words)
Approximate price: -

Why Work with Us

Top Quality and Well-Researched Papers

We always make sure that writers follow all your instructions precisely. You can choose your academic level: high school, college/university or professional, and we will assign a writer who has a respective degree.

Professional and Experienced Academic Writers

We have a team of professional writers with experience in academic and business writing. Many are native speakers and able to perform any task for which you need help.

Free Unlimited Revisions

If you think we missed something, send your order for a free revision. You have 10 days to submit the order for review after you have received the final document. You can do this yourself after logging into your personal account or by contacting our support.

Prompt Delivery and 100% Money-Back-Guarantee

All papers are always delivered on time. In case we need more time to master your paper, we may contact you regarding the deadline extension. In case you cannot provide us with more time, a 100% refund is guaranteed.

Original & Confidential

We use several writing tools checks to ensure that all documents you receive are free from plagiarism. Our editors carefully review all quotations in the text. We also promise maximum confidentiality in all of our services.

24/7 Customer Support

Our support agents are available 24 hours a day 7 days a week and committed to providing you with the best customer experience. Get in touch whenever you need any assistance.

Try it now!

Calculate the price of your order

Total price:

How it works?

Follow these simple steps to get your paper done

Place your order

Fill in the order form and provide all details of your assignment.

Proceed with the payment

Choose the payment system that suits you most.

Receive the final file

Once your paper is ready, we will email it to you.

Our Services

No need to work on your paper at night. Sleep tight, we will cover your back. We offer all kinds of writing services.


Essay Writing Service

No matter what kind of academic paper you need and how urgent you need it, you are welcome to choose your academic level and the type of your paper at an affordable price. We take care of all your paper needs and give a 24/7 customer care support system.


Admission Essays & Business Writing Help

An admission essay is an essay or other written statement by a candidate, often a potential student enrolling in a college, university, or graduate school. You can be rest assurred that through our service we will write the best admission essay for you.


Editing Support

Our academic writers and editors make the necessary changes to your paper so that it is polished. We also format your document by correctly quoting the sources and creating reference lists in the formats APA, Harvard, MLA, Chicago / Turabian.


Revision Support

If you think your paper could be improved, you can request a review. In this case, your paper will be checked by the writer or assigned to an editor. You can use this option as many times as you see fit. This is free because we want you to be completely satisfied with the service offered.

Live Chat+1(978) 822-0999EmailWhatsApp

Order your essay today and save 20% with the discount code RESEARCH

slot online
seoartvin escortizmir escortelazığ escortbacklink satışbacklink saleseskişehir oto kurtarıcıeskişehir oto kurtarıcıoto çekicibacklink satışbacklink satışıbacklink satışbacklink