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The means and variances of weekly incomes in rupees of two samples of two workers are given in following table, the sample being randomly drawn from two different factories:
Factory Sample Size Mean Variance
A .
B .
Calculate% confidence interval for real difference in incomes of workers from two categories.
your sample is randomly drown if and only if the workers are randomly selected with no regard to any categorized lists (i.e. average income, department, speciality, age, ...,etc.)
The probabilty of each worker in your sample to be selected must be equal and it should be calculated as1 over the whole number of your workers.
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