week 5.docx - Week 5 Chapter 7a Sampling sampling distributions Determine when to use sampling instead of a census o Take census to eliminate

week 5.docx - Week 5 Chapter 7a Sampling sampling...

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Week 5 Chapter 7a Sampling & sampling distributions Determine when to use sampling instead of a census o Take census to eliminate possibility that by chance a random sample may not be representative of the population Safety of consumer o Take sampling to Save money and time If accessing population is impossible Can broaden scope of the data set Research process is sometimes destructive, sample can save product. Distinguish between random and nonrandom sampling o Random Every unit of the population has ?? (skipped over it in class) o Stratified random sample\ Proportionate % of the sample taken from each sta (skipped) o Sampling error occurs when the sample is not representative of the population o Expected sampling error decreases as the sample size increases. Understand the impact of the Central Limit Theorem on statistical analysis o If ´ x is the mean of a random sample of size n from a population with mean of μ and standard deviation of σ , then as n
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  • Fall '14
  • IgnacioCastillo

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