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

Margin of error, The poll interviewed 1500 persons rather than 1060, for 95...

The poll interviewed 1500 persons rather than 1060, for 95% confidence.

Generally accepted accounting principles-gaap, Generally Accepted Accountin...

Generally Accepted Accounting Principles-GAAP:  GAAP is an Americanized term for the accounting standards and procedures that need to be followed by companies while compiling their

Normal curve and the standard deviation, What is the relationship between t...

What is the relationship between the normal curve and the standard deviation? Name and explain three special features of a normal distribution

Find the probability, Question: (a) Find the number of different words...

Question: (a) Find the number of different words which can be formed with the letters A, A, A, B, B, C, C if (i) there is no restriction (ii) they must st

STATISTICAL & NUMERICAL METHODS, A and B throw with one dice for a prize of...

A and B throw with one dice for a prize of Rs.11 which is to be won by a player who first throws 6. If A has the first throw, what are their respective expectations?

Card custodian, Card custodian An person who is assigned responsibility of...

Card custodian An person who is assigned responsibility of purchase card security & issuance of cards to authorized users,

Why Agency code is useful, Why Agency code is useful The four personality n...

Why Agency code is useful The four personality number code allocated by the Workplace of Economical Control to select the unique business models of condition. Organization requirem

Find karl pearson''s correlation coefficient, Find Karl Pearson's correlati...

Find Karl Pearson's correlation coefficient between the sales and expenses from the data given below:

Karl Pearsons, ). Calculate Karl Pearson’s coefficient of correlation from...

). Calculate Karl Pearson’s coefficient of correlation from the following data , using 20 as the working mean for price and 70 as the working mean for demand: Price: 14 16 17 18 1

When are expenses credited, When are expenses credited? While common jo...

When are expenses credited? While common journal cost records are typically debited and have debit account balances, there are times when the cost records are acknowledged.

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