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

#test, The AM of 10 numbers are 20 and 30 numbers are 60 then find AM of co...

The AM of 10 numbers are 20 and 30 numbers are 60 then find AM of combined data

#mean, Uses of mean

Uses of mean

Hypothesis, What is a hypothesis test? Why do we need to use them to make ...

What is a hypothesis test? Why do we need to use them to make decisions about relating sample results to the population; why can’t we just make our decisions by the sample value?

Evaluate the probability, Question 1: (a) 75 percent of all people in a...

Question 1: (a) 75 percent of all people in a population are vaccinated against a par-ticular disease. During an epidemic, the probability that a vaccinated person is infected

Variation Coefficient, Variation Coefficient The standard deviation discus...

Variation Coefficient The standard deviation discussed above is an absolute measure of dispersion. The corresponding relative measure is known as the coefficient of variation. Thi

Histogram, difference between histogram and historigram

difference between histogram and historigram

What is bond premium and face value of bond, Defining of bond premium in te...

Defining of bond premium in terms of the amount paid over the face value of the bond. And the amount over and above the Face Value of bond which the purchaser pays is called Bond P

Discrete Standard Deviation, Discrete Standard Deviation For calculating s...

Discrete Standard Deviation For calculating standard deviation in discrete series any of the following methods may be applied (1) Actual mean method. (2) Assumed mean method. (

Role of accountant, What are the roles of accountant, let me know the caree...

What are the roles of accountant, let me know the career opportunity in accounting subject?

What is cut-off date, What is cut-off date A chosen manually date whereby ...

What is cut-off date A chosen manually date whereby transactions usually are stopped to give for closing of the books of accounts for a known period: for audit purposes,

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