AP+Statistics+Chapter+10+section+1

# AP+Statistics+Chapter+10+section+1 - Chapter 10 Section 1...

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Chapter 10 Section 1

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Statistical Inference 1. State a hypothesis about the population. 2. Gather data related to this hypothesis. 3. Ask, “If the original hypothesis is true, how likely is it that we would observe the data we actually collected? 4. Formulate an alternative hypothesis.
Inference is reliable ??? IF the data are produced by a properly randomized design. Methods of formal inference require long-run regular behavior that probability describes. USE COMMON SENSE developed in your study of the first five chapters of this book, and proceed to formal inference only when you are satisfied that the data deserve such analysis.

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Vocab Statistical inference Confidence Intervals – estimates the value of a population parameter Tests of significance – assesses the evidence for a claim about a population.
Young people have a better chance of full- time employment and good wages if they are good with numbers. How strong are the quantitative skills of young Americans of working age?

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National Assessment of Educational Progress (NAEP) Young Adult Literacy Assessment Survey – which is based upon a nationwide probability sample of households. The survey includes a short test of quantitative skills, covering mainly basic arithmetic and the ability to apply it to realistic problems. Scores range from 0 to 500.
Examples of scores (Are you kidding me?) 233 – can add the amounts of two checks appearing on a bank deposit slip 325 – can determine the price of a meal from a menu 375 – can transform a price in cents per ounce into dollars per pound

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Study In a recent year, 840 men 21 to 25 years of age were in the NAEP sample: 840 272 = = n x On the basis of this SRS of 840 men, what can we say about the mean score in the population of all 9.5 million young men of these ages?
x -- Has a normal distribution. (Central Limit Theorem) The mean of this normal sampling distribution is the same as the unknown population mean. The standard deviation is:

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## This note was uploaded on 04/10/2011 for the course MATH 1070 taught by Professor Akbas during the Fall '08 term at Georgia State.

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AP+Statistics+Chapter+10+section+1 - Chapter 10 Section 1...

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