User Account

All Pages

R programm, statistics, Basic Statistics

Assignment Help:
1. Generate a large dataset ( at least 1000 observations) µ with a known mean, µ between 20 and 40 and variance s = 9 using rnorm(). identify it as D. Use the functions mean() and var() to get the mean and vaiance of the sample.
2. Use t.test(D, mu=0) to check if the mean of your realizations, ¯x is signi?cantly
different from zero, from µ1, and from (µ0:1).
3. produce a histogram for D with vertical lines at the 0.25
th
and the 97.5
th
quantiles.
4. generate 10 samples of 20, S1 .....S10 with random means using S1<- rnorm(20,runif(1,min=0,max
= 80)), then calculate means and variances for each.
5. Use t.test(D, S1) to check if the sample means for S1 .....S10 are likely to have come
from the same population as the large distribution D. This Stat Trek webpage is a
good source. You should be using 2-tailed tests.
6. Explain the difference between a one-tailed test and a two-tailed test.
7. Create two variables, x and y, where y is a deterministic linear function of x. Show
the formula you used.
8. Generate a plot of y against x.
9. Calculate the correlation between y and x.covariance of y and x.
10. Create a new variable, yRan, that is like y except that it contains some random noise.
11. Calculate the correlation between yRan and x and the covariance of yRan and x.
12. Add more noise to yRan. Calculate the covariance of yRan and x and the Pearsonian correlation coef?cient. State how adding more noise affects the correlation
coef?cient.
13. Conduct the following experiment. Start with a deterministic function as in part 8
with a positive slope. Add some noise. Now systematically reduce the slope from
positive to negative, taking care to make quite a few observations near zero. Keep
the noise parameters constant. Make a table showing the slope vs the correlation
coef?cient.
14. Plot the slope vs the correlation coef?cient from the previous question and say what
you learn from the exercise.

Related Discussions:- R programm, statistics

Descriptive statistics, The descriptive statistics outputs for both the var...

The descriptive statistics outputs for both the variables are as below: Wii Group Mean 95.8 Standard

How this works, So I can send you a word problem & you van send the answers...

So I can send you a word problem & you van send the answers back in excel for me?

What do you mean by purchase return, What do you mean by Purchase Return? G...

What do you mean by Purchase Return? Give an example. Ans.  Sometime the goods an organization orders are not up to the mark and they are not supposed to keep or accept so th

Define tension and stress, Tension: When a sequence, place, cable or a man ...

Tension: When a sequence, place, cable or a man is presented tight, the ends of the sequence or place (or wire) pull on whatever systems are connected to them towards the sequence.

What after the implementation of ifrs, What after the implementation of IFR...

What after the implementation of IFRS?  Manager 1: IFRS is only the first step towards the change that the SEC is trying to bring in. Firstly it is going to take a couple of year

Determine the upper and lower control limits, You should show your work to ...

You should show your work to earn partial credit.  You must show ALL of your work on the pages provided.  There should be plenty of room to show your work on the page with each pro

Calculate the mean absolute percentage error, Littlefield Laboratories is a...

Littlefield Laboratories is a state-of-the-art highly automated blood samples testing lab. The demand of blood sample testing for the previous 20 days (day 1 to day 20) are given i

Determine the payment at maturity - exchange rate, You have the following l...

You have the following limited information upon which to base your decision as to which is the better of two alternative funding arrangements:  Alternative 1 is to arrange fu

Revenues , why are revenues an important number in financial statements?

why are revenues an important number in financial statements?

Probability, A manufacturer of VCRs plans to purchase a particular componen...

A manufacturer of VCRs plans to purchase a particular component from suppliers A, B and C. 30% of the components are to be purchased from A, 20% from B and 50% from C. In the past,

Write Your Message!

Captcha
Order Assignment

Featured Services

Order Now

Popular Subjects

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!

Submit Assignment

Academics

Major Subjects

Majors

Get In Touch

whatsapp: +91-977-207-8620

Phone: +91-977-207-8620

Email: [email protected]

TERMS & POLICIES

HELP & SUPPORT

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd