# Math homework help

Anonymous

### Question Description

(5 points) Choose a population and a quantitative variable which is

approximately normally distributed within this population. Clearly

state your choices in a few sentences.

2. (20 points) Justify why your variable is normally distributed within its

population in a few sentences.

3. (15 points) Guess a value for the population standard deviation σ.

Justify your guess in a few sentences.

4. (20 points) Collect a simple random sample of 20−30 individuals from

your population. Give a detailed description of your sampling method

and justify why it is a simple random sampling method in one to two

paragraphs.

5. (30 points) Compute z-confidence intervals using your sample data,

guess of σ, and confidence levels of 90%, 95%, and 99%. Your work

should include the value of ̄x, your z

-value for each confidence level,

and the actual intervals themselves.

6. (10 points) Explain what these three confidence intervals together tell

you about the value of the population mean μ. Justify your answer in

one to two paragraphs.

### Unformatted Attachment Preview

Purchase answer to see full attachment

psumanrec
School: University of Virginia

1

Project 2
Name
University Name
Course
July 09, 2019

STAT

2
Project 2
The population for the study is the income of the individuals living in the Oregon state of

the US. Thus, the quantitative variable is the individual’s income residing in the Oregon state.
The distribution of income can be said to be approximately normally distributed.
In a normal distribution, the majority of the data points are relatively similar, which occur
on a small range of values (Stephens, 2011). In the lower end and upper end of the data, few
outliers can be found .The graph of the normal distribution comes in the form of bell-shaped and
the mean, median, and mode coincide with the peak of the curve. Here, income can be
considered as having normal distribution as there will be few individuals in the lower and higher
income categories. Further, ...

flag Report DMCA
Review

Anonymous
I was on a very tight deadline but thanks to Studypool I was able to deliver my assignment on time.

Anonymous
The tutor was pretty knowledgeable, efficient and polite. Great service!

Anonymous
I did not know how to approach this question, Studypool helped me a lot.

Studypool
4.7
Trustpilot
4.5
Sitejabber
4.4

Brown University

1271 Tutors

California Institute of Technology

2131 Tutors

Carnegie Mellon University

982 Tutors

Columbia University

1256 Tutors

Dartmouth University

2113 Tutors

Emory University

2279 Tutors

Harvard University

599 Tutors

Massachusetts Institute of Technology

2319 Tutors

New York University

1645 Tutors

Notre Dam University

1911 Tutors

Oklahoma University

2122 Tutors

Pennsylvania State University

932 Tutors

Princeton University

1211 Tutors

Stanford University

983 Tutors

University of California

1282 Tutors

Oxford University

123 Tutors

Yale University

2325 Tutors