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Answer to Question #27184 in Statistics and Probability for florida

Question #27184
TK 1153 Statistics Assignment 1 (10%)
1. 2. 3.


Matric No.

Instructions: I. Due on 27 Mar 2013 (Wed) at 12:30pm. 5 % will be deducted if I receive it less than 24 hours after due time. If I receive it 24 hours after due time, 10% will be deducted i.e. you’ll be getting 0% from this assignment.) II. Whenever SPSS package is used, you also have to write down all steps that lead you to conclusion and you have to submit data sheet and output to get full mark. III. Staple your assignment at the top left hand corner. Do not bind. Use A4 size paper only. IV. This assignment is to be done in a group of 3. Questions: 1. Atomic absorption spectrometry (AAS) analysis of sewage water samples for 10 months (January to October) in 2000 gave the following concentrations of zinc (μg/L). Jan Feb Mac Apr May Jun Jul Aug Sep Oct 195 182 204 202 190 186 192 198 193 188 a) Calculate the mean, variance and standard deviation of zinc concentration, and the 95% confidence interval of the mean zinc concentration for the year 2000. b) Assuming that the maximum allowable Zn content in sewage water is 185 μg/L. Is there evidence that the Zn concentration exceeded the maximum allowable value? In 1999, the concentrations of Zn in sewage water samples for the first 10 months of the year were as follows: Jan 193 Feb 180 Mac 200 Apr 198 May 185 Jun 183 Jul 190 Aug 194 Sep 188 Oct 187

d) Comparing the mean Zn concentration in 2000 with that of 1999, has the Zn concentration in sewage water increased? e) Is there any significant difference in the mean Zn concentrations in 2000 compared with that of 1999? 2. Titanium contents of steel (%) was determined by means of atomic absorption spectrometry by two students, John and Sulaiman. By using SPSS, answer the questions below: John 0.470 Sulaiman 0.448 0.529 0.463 0.490 0.449 0.489 0.482 0.521 0.454 0.486 0.477 0.502 0.409

a) Is there any significant difference in the precision of the two students? b) Is there any significant... [continues]
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