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

Time series, Explain how you would decide whether to use the additive model...

Explain how you would decide whether to use the additive model or the multiplicative model to analyse a time series.

Probability mass function, how p(x)=hyper geometric distribution is probabi...

how p(x)=hyper geometric distribution is probability mass function

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?

What is degrees of freedom, What is  Degrees of Freedom : While comparing ...

What is  Degrees of Freedom : While comparing the calculated value of X2 with the table value we have to determine the degrees of freedom. By degrees of freedom we mean the number

Management accounting, 19. Welnor Industrial Gas Corporation supplies acety...

19. Welnor Industrial Gas Corporation supplies acetylene and other compressed gases to industry. Data regarding the store''s operations follow: • Sales are budgeted at $320,000 fo

STATISTICS FOR MANAGEMENT, 1. Mention the characteristics of Statistics. Ex...

1. Mention the characteristics of Statistics. Explain any two applications of Statistics. 2. Distinguish between primary and secondary data. What are the methods of collecting prim

Statistics in plural and singular form, how to deffine statistics in plura...

how to deffine statistics in plural and singilar form

Calculate the probability , In the 2009 Season, the Toronto Blue Jays finis...

In the 2009 Season, the Toronto Blue Jays finished the season with a record of 75-87. In 47 of those games, both the offense and defense performed adequately, and in 42 of them, ne

#title.business statistics, Test the null at 1? significance level

Test the null at 1? significance level

Cash basis, Cash basis A basis for accounting whereby revenues are recorde...

Cash basis A basis for accounting whereby revenues are recorded only when received & expenses are recorded only that salaried with no regard to the era in which they be earned, in

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