Relation of positive integers
R is the relation of positive integers N that meet R={(x,y) | x + 3y = 12}. Represent R as a set of ordered pairs. Represent R in set form (domain and range). Compute R^-1, R%u0305 and R o R (represent the composition in matrix form).
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Discuss how the notion of union and intersection apply to retrieving records in databases. Give an example of 2 sets that might appear in a database to help in your description.
A sample of 64 "AAA" Alkaline batteries has mean life of 7 months. The standard deviation of the population is known to be 2 months. Find the 95% confidence interval of the popualtion mean life of "AAA" Alkaline batteries?
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The standard deviation of the population is known to be 4 months. Find the 90% confidence interval of the popualtion mean life of "AA" Alkaline batteries.
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