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

Normal distribution, Lifts usually have signs indicating their maximum capa...

Lifts usually have signs indicating their maximum capacity. Consider a sign in a lift that reads “maximum capacity 1400kg or 20 persons”. Suppose that the weights of lift-users are

Index numbers, discuss the considerations to be borne in mind when construc...

discuss the considerations to be borne in mind when constructing index numbers

Analyze frequency distribution, how to find decile

how to find decile

Barter system, Define the barter system with examples where payment is made...

Define the barter system with examples where payment is made in kind instead of cash. A barter system whereby the payment for purchases is made in kind instead of, in cash. i.e.

Define Ancillary costs, Define Ancillary costs Expenditures that is direct...

Define Ancillary costs Expenditures that is directly attributable to resource acquisition, such as freight and transportation costs, site preparation costs, and professional charg

Explain accounting methods, Define various methods in accounting, specifica...

Define various methods in accounting, specifications and procedures.

Probability and stochastic process, In a quaternaryphase shift keying (QPSK...

In a quaternaryphase shift keying (QPSK) communications system, one of four equally probable symbols s0,...,s3 is transmitted in T seconds. If symbol si is sent, a waveform x(t,si)

Explain correlation coefficients, 1. What type of correlation coefficient w...

1. What type of correlation coefficient would you use to examine the relationship between the following variables? Explain why you have selected the correlation coefficients. A.

Federal income tax, Federal income tax Another part of paycheck account...

Federal income tax Another part of paycheck accounting involves the staff's got earnings tax. A company is necessary to hold the got earnings tax that and personnel are expecte

Hypotheses- sampling methodology or data collection design, Research Assign...

Research Assignment for Quantitative Methods 2 Purpose: To design, undertake and analyse research on a negotiated project, possible themes could be any one of the following:

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