AP统计学公开课重难点专场第六场.pdf

AP统计学公开课重难点专场第六场 主讲：云舟-APstat-桂老师 AP-stat(统计) 课程地址：/course/1585436474 声音检测 •感觉声音很流畅的同学打1 •感觉声音不流畅的同学打0 版权归云舟所有 2012-10-3 1 AP Statistics 7 ：tests of significance 云舟国际课程中心 统计组 桂耀老师 Email:406891530@ 人人网主页：/359950110 版权归云舟所有 2012-10-3 2 Statistical Inference  A. Estimation  B. Tests of significance 3 B. Tests of significance  Logic of significance testing, null and alternative hypothesis; A significance testing is a formalized procedure to determine the validity of a claim about the population. the null hypothesis, is the hypothesis we are actually testing. the alternative hypothesis, is the theory that the researcher wants to confirm by rejecting the null hypothesis. 4 21.An automobile manufacturer claims that the average gas mileage of a new model is 35 miles per gallon (mpg). A consumer group is skeptical of this claim and thinks the manufacturer may be overstating the average gas mileage. If u represents the true average gas mileage for this new model, which of the following gives the null and alternative hypotheses that the consumer group should use? 5 5.A safety group claims that the mean speed of drivers on a highway exceeds the posted speed limit of 65 miles per hour (mph). To investigate the safety group’s claim, which of the following statements is appropriate? 6 B. Tests of significance  Logic of p-values P-value is the probability of getting a finding (statistic) as extreme, or more extreme, as we obtained by chance alone. – A deci