Set the statistical population of Exercise 7 in the R object
Set the statistical population of Exercise 7 in the R object (vector) x by x = c(rep(0, 190), rep(1, 160), rep(2, 150)).
(a) The R commands y = sample(x, 100); table(y)/100 select a sample of size n = 100 and compute the proportions for the three categories. Repeat these commands a total of five times, report the results, and give the population proportions that the sample proportions estimate.
(b) The R commands y = sample(x, 100); mean(y); var(y); sd(y) select a sample of size n = 100 and compute the sample mean, sample variance, and sample standard deviation. Repeat these commands a total of five times, report the results, and give the values of the population parameters that are being estimated.
Exercise 7
Refer to Exercise 1 in Section 1.4.
(a) For the statistical population corresponding to the number of scratches of the 500 tin plates described in the exercise (N0 = 190 0’s, N1 = 160 1’s and N2 = 150 2’s), find the population mean, the population variance, and the population standard deviation.
(b) A simple random sample of n = 100 from the above statistical population consists of n0 = 38 0’s, n1 = 33 1’s, and n2 = 29 2’s. Find the sample mean, the sample variance, and the sample standard deviation.
Exercise 1
In a population of 500 tin plates, the number of plates with 0, 1, and 2 scratches is N0Â = 190, N1Â = 160, and N2Â = 150.
(a) Identify the variable of interest and the statistical population.
(b) Is the variable of interest quantitative or qualitative?
(c) Is the variable of interest univariate, bivariate, or multivariate?
Â
Answers
Status NEW
Posted 19 May 2017 12:05 PM
My Price 7.00
-----------
Attachments
file 1495195806-Answer.docx preview (352 words )
S-----------et -----------the----------- st-----------ati-----------sti-----------cal----------- po-----------pul-----------ati-----------on -----------of -----------Exe-----------rci-----------se -----------7 i-----------n t-----------he -----------R o-----------bje-----------ct -----------(ve-----------cto-----------r) -----------x b-----------y x----------- = -----------c(r-----------ep(-----------0, -----------190-----------), -----------rep-----------(1,----------- 16-----------0),----------- re-----------p(2-----------, 1-----------50)-----------). ----------- (a-----------) T-----------he -----------R c-----------omm-----------and-----------s y----------- = -----------sam-----------ple-----------(x,----------- 10-----------0);----------- ta-----------ble-----------(y)-----------/10-----------0 s-----------ele-----------ct -----------a s-----------amp-----------le -----------of -----------siz-----------e n----------- = -----------100----------- an-----------d c-----------omp-----------ute----------- th-----------e p-----------rop-----------ort-----------ion-----------s f-----------or -----------the----------- th-----------ree----------- ca-----------teg-----------ori-----------es.----------- Re-----------pea-----------t t-----------hes-----------e c-----------omm-----------and-----------s a----------- to-----------tal----------- of----------- fi-----------ve -----------tim-----------es,----------- re-----------por-----------t t-----------he -----------res-----------ult-----------s, -----------and----------- gi-----------ve -----------the----------- po-----------pul-----------ati-----------on -----------pro-----------por-----------tio-----------ns -----------tha-----------t t-----------he -----------sam-----------ple----------- pr-----------opo-----------rti-----------ons----------- es-----------tim-----------ate-----------. -----------(b)----------- Th-----------e R----------- co-----------mma-----------nds----------- y -----------= s-----------amp-----------le(-----------x,
Not Rated(0)