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

Central tendency, List down various measures of central tendency and explai...

List down various measures of central tendency and explain the difference between them?

The correlation coefficient to identify collocations, Would there be a poss...

Would there be a possibility to use the correlation coefficient to identify collocations? Compare with the Chi2 test. • How could we maybe do that?

Pre tax in Statement of Cash Flows, Advanced Equipment leased equipment to ...

Advanced Equipment leased equipment to Richards Chemical, Inc. on 9/30/11. Advanced purchased the machine from Makers, Inc. at a cost of $6M. The 5-yr lease agreement calls for R

Marginal costing and break-even analysis, Marginal costing and Break-even a...

Marginal costing and Break-even analysis According to C.I.M.A. Manchester, "Marginal Price means the quantity at any given variety of result by which get worse scenario costs ar

Probability, A machine that cuts corks for wine bottles operates in such a ...

A machine that cuts corks for wine bottles operates in such a way that the distribution of the diameter of the corks produced is well approximated by a normal distribution with mea

IFRS 9, The company acquired 50000 8% preferencd shares (with a par value o...

The company acquired 50000 8% preferencd shares (with a par value of R4 each) in cross limited on 30 june 2006 for R180000.

What is appropriate and parametric statistical procedure , Questions 1....

Questions 1.  What would be the appropriate statistical procedure to test the following hypothesis:  "Triglyceride values are a good predictor of weight in obese adults." 2.

A congruential unit random number generator, Suppose the arrival times of p...

Suppose the arrival times of phone calls in a help centre follow a Poisson process with rate 20 per hour (so the inter-arrival times are independent exponential random variables).

Himself, how r yopu

how r yopu

Prepares reports on gasoline prices , The average cost of a gallon of unlea...

The average cost of a gallon of unleaded gasoline in Greater Cincinnati was reported to be $2.41 (The Cincinnati Enquirer, February 3, 2006). During periods of rapidly changing pri

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