What is a hypothesis test?  Why do we need to use them to make decisions about relating sample results to the population; why can’t we just make our decisions by the sample value?

Variation exists in virtually all parts of our lives. We often see variation in results in what we spend (utility costs each month, food costs, business supplies, etc.).  Consider the measures and data you use (in either your personal or job activities). When are differences (between one time period and another, between different production lines, etc.) between average or actual results

 

 

 

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