Homework Help: statistics

Posted by sireesha on Friday, June 10, 2011 at 1:55am.

1. Draw a simple random sample of 15 students from your class, and calculate sample mean and sample variance of their heights(use Lottery method )
2. Three blocks of Coal were analyzed by Four Chemists and the ash-content in the blocks was found to be as under:

Chemists

Blocks I II III IV

A 18 15 15 17

B 17 16 14 14

C 13 16 15 14

Do the blocks differ in their ash-content? Do the chemists differ significantly their analysis?
In the above examples, identify the following.

i. Experiment

ii. Experimental unit

iii. Treatments

iv. Varieties/blocks

v. Experimental error

vi. Yield

vii. Replication

viii. Randomization

ix. Local control if any

3. Collect the annual sales of a Super market for 10 years and fit a straight line Trend to the data collected and find the trend values.
4. Explain laws of supply and demand by taking at least 1 item for each type of commodity

statistics - PsyDAG, Friday, June 10, 2011 at 12:46pm
Please only post your questions once. Repeating posts will not get a quicker response. In addition, it wastes our time looking over reposts that have already been answered in another post. Thank you.

I answered #1 in your previous post.

2. Use a 3 by 4 X^2 (Chi-Square) test.

http://www.google.com/search?client=safari&rls=en&q=chi+square+test&ie=UTF-8&oe=UTF-8

Without the data, we cannot respond to #3 or 4.

Lastly, we do not do your work for you. Once you have attempted to answer your questions, we will be happy to give you feedback on your work. Although it might require more time and effort, you will learn more if you do your own work. Isn't that why you go to school?

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