Thursday
April 17, 2014

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

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