a)662.5 b)775.2 6411 el 2 4- and medien ajo b584 5 )595 404 e) 347 Mercury is a

Question

a)662.5 b)775.2 6411 el 2 4- and medien ajo b584 5 )595 404 e) 347 Mercury is a persistent and dispersive environmental contaminant found in many ecosystems around the world. When released as an industrial by product, it often finds its way into aquatic systems where it can have deleterious effects on various avian and aquatic species. The accompanying data on blood mercury concentration (ug/e) for adult females near contaminated rivers in a state was read from a graph in an article, 0.21 0.22 0.26 0.30 0.34 0.42 0.55 0.57 1.41 1.71 1.84 2.20 2.24 3.08 3.25 5- Determine the value of the a0%timmedmen a)o b).22 e) 1.120 d10 e)325 A study of the relationship between age and various visual functions (such as acuity and depth perception) reported the following observations on the area of scleral lamina (mm2) from human optic nerve heads: 2.67 2.64 2.74 3.75 2.31 2.69 3.92 4.11 3.81 4.23 3.49 4.44 2.38 3.59 2.73 3.55 3.08 6- Compute s2 a) 0.473 b)2.35 c)-1 d)0.99 e)12 7 and 8 A sample of 26 offshore oil workers took part in a simulated escape exercise, resulting in the accompanying data on time (sec) to complete the escape. Here is a stem-and-leaf display of escape time data.

Explanation / Answer

5. By triming 10% values from the sample point.

Since sample sise is 15. Trim 1 observation from both side.

hence

Mean = (0.22+0.26+0.30+0.34+0.42+0.55+0.57+1.41+1.71+1.84+2.20+2.24+3.08)/13

=15.14/13

=1.16

From the Option we select 1.12.

b) ## By using R

> x=c(2.67,2.64,2.74,3.75,2.31,2.69,3.92,4.11,3.81,4.23,3.49,4.44,2.38,3.59,2.73,3.55,3.08)
> x
[1] 2.67 2.64 2.74 3.75 2.31 2.69 3.92 4.11 3.81 4.23 3.49 4.44 2.38 3.59 2.73
[16] 3.55 3.08
> var(x)   
[1] 0.4730154 ###S^2
>

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