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

Analysis and interpretation business report, Case Study. Using the data, pr...

Case Study. Using the data, prepare a report that analyses the profitability, liquidity and solvency of a Accessorize Pty Ltd and help the owner to decided whether to purchase the

Revenue accounting, Term Project

Term Project

Introduction to statistics, characteristics of statistics

characteristics of statistics

Measurement of central tendency, assignement

assignement

Bond premium cycle, Bond premium cycle The excess of the price for which a ...

Bond premium cycle The excess of the price for which a connection is acquired or sold over its face value resulting from a disparity connecting the market rate of interest and the

Spectral Hydrogen Atom, Long before Bohr gave his theory of hydrogen atom, ...

Long before Bohr gave his theory of hydrogen atom, various scientists had observed experimentally, the spectral series of hydrogen atom. Bohr offered a theoretical explanation of t

General linear regression model, find the variance of least square estimato...

find the variance of least square estimator beta hat for general linear regression model

Define Accrued liabilities , Obligations showing the responsibility to pay ...

Obligations showing the responsibility to pay for solutions or products that have been suffered or obtained but not compensated for by the end of the sales interval.

Data for ogive graph, Data for ogive graph in sectors of indian economy

Data for ogive graph in sectors of indian economy

Transition towards ifrs, Transition towards IFRS Over the last few year...

Transition towards IFRS Over the last few years, there has been a tremendous change in the world's capital markets. There has thus been a shift away from the local financial re

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