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

Exploratory analysis of the data, The Home Improvement Company (HIC) operat...

The Home Improvement Company (HIC) operates five stores in a large regional area. The company wished to study the relationship between x, house value ($'000) and Y, yearly expendit

Trading account, What is Trading account

What is Trading account

Financial limitations and expertise, Expertsmind.com offering Limitations ...

Expertsmind.com offering Limitations and expertise in financial accounting In Financial sales it is also useful in the following respects:- (1) Increased volume of finan

Determine ytm price formula, YTM can be determined using the price formula...

YTM can be determined using the price formula of a bond. Part a The present value (price) formula for a zero coupon bond is: PV = F/(1+i) n Plugging in the given inf

Quantitative techniques, what are the funtions of quantitative techniques

what are the funtions of quantitative techniques

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

Obtain the critical value for a hypothesis test, Obtain the critical value ...

Obtain the critical value (or values) for a hypothesis test for the mean if you conduct: (a) an upper tail "z" test at the 1% level of significance. (b) a two-tailed "z" test

Find the value, Find the value of E (i+). Show your calculation. i=7 i=3

Find the value of E (i+). Show your calculation. i=7 i=3

Tax, _______ 1. F''s share of income from various sources is as follows for...

_______ 1. F''s share of income from various sources is as follows for the current year: Source F''s Share of Entity''s Net Income F''s Share of Distributions ABC Partnership after

What is the probability that a major defect is detected, Back to the worksh...

Back to the workshop the previous problem but assuming that in each of the three stages of development, there is a certain probability that a major defect is detected. When such a

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