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

HYPOTHESIS TESTING, The fluctuations in the stock market induce some invest...

The fluctuations in the stock market induce some investors to sell and move their money into more stable investments. To determine the degree to which recent fluctuation affected o

Transitioning from gaap to ifrs, How important do you think knowledge trans...

How important do you think knowledge transfer and training will be to help in transitioning from GAAP to IFRS? Manager 1: Knowledge transfer is going to be extremely importan

Basic Statistics, 1

1

Time series, what are the importances of time series

what are the importances of time series

Cost behavior/classificationq, Shipping costs on Merchandise sold--it is a ...

Shipping costs on Merchandise sold--it is a variable cost, but is it a selling/adminstrative cost or product cost? Is it direct or indirect?

Differentiate between sample and population, Ask question #Midifferentiate ...

Ask question #Midifferentiate between sample and populationnimum 100 words accepted#

Reproduction rates, Reproduction rates: if the majority of births are thos...

Reproduction rates: if the majority of births are those of boys the population is bound to decrease while the reverse will be the case if the majority of births are girls. Similar

Level of significance, Consider the sample data for plants A, B, C & D of t...

Consider the sample data for plants A, B, C & D of the above company, which are tabulated in table 1. Test whether the four means are equal at the 5% level of significance. Perform

Cash discount., Cash discount A payment received, given if payment is comp...

Cash discount A payment received, given if payment is completed within a stated age of occasion, Refer to TRADE DISCOUNT,

TRENDS , Why do we particularly omit the middle year when using the semi-av...

Why do we particularly omit the middle year when using the semi-average method to fit a trend line

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