freepeople性欧美熟妇, 色戒完整版无删减158分钟hd, 无码精品国产vα在线观看DVD, 丰满少妇伦精品无码专区在线观看,艾栗栗与纹身男宾馆3p50分钟,国产AV片在线观看,黑人与美女高潮,18岁女RAPPERDISSSUBS,国产手机在机看影片

正文內(nèi)容

estimationandhypothesistestingfortwopopulationparameters(編輯修改稿)

2024-09-24 18:26 本頁(yè)面
 

【文章內(nèi)容簡(jiǎn)介】 ple sizes ? 30 or not ? 30 Business Statistics: A DecisionMaking Approach, 6e 169。 2020 PrenticeHall, Inc. Chap 920 Hypothesis Tests for Two Population Proportions Lower tail test: H0: μ1 ? μ2 HA: μ1 μ2 ., H0: μ1 – μ2 ? 0 HA: μ1 – μ2 0 Upper tail test: H0: μ1 ≤ μ2 HA: μ1 μ2 ., H0: μ1 – μ2 ≤ 0 HA: μ1 – μ2 0 Twotailed test: H0: μ1 = μ2 HA: μ1 ≠ μ2 ., H0: μ1 – μ2 = 0 HA: μ1 – μ2 ≠ 0 Two Population Means, Independent Samples Business Statistics: A DecisionMaking Approach, 6e 169。 2020 PrenticeHall, Inc. Chap 921 Hypothesis tests for μ1 – μ2 Population means, independent samples σ1 and σ2 known σ1 and σ2 unknown, n1 and n2 ? 30 σ1 and σ2 unknown, n1 or n2 30 Use a z test statistic Use s to estimate unknown σ , approximate with a z test statistic Use s to estimate unknown σ , use a t test statistic and pooled standard deviation Business Statistics: A DecisionMaking Approach, 6e 169。 2020 PrenticeHall, Inc. Chap 922 Population means, independent samples σ1 and σ2 known σ1 and σ2 unknown, n1 and n2 ? 30 σ1 and σ2 unknown, n1 or n2 30 ? ? ? ?2221212121nσnσμμxxz?????The test statistic for μ1 – μ2 is: σ1 and σ2 known * Business Statistics: A DecisionMaking Approach, 6e 169。 2020 PrenticeHall, Inc. Chap 923 Population means, independent samples σ1 and σ2 known σ1 and σ2 unknown, n1 and n2 ? 30 σ1 and σ2 unknown, n1 or n2 30 σ1 and σ2 unknown, large samples The test statistic for μ1 – μ2 is: ? ? ? ?2221212121nsnsμμxxz?????* Business Statistics: A DecisionMaking Approach, 6e 169。 2020 PrenticeHall, Inc. Chap 924 Population means, independent samples σ1 and σ2 known σ1 and σ2 unknown, n1 and n2 ? 30 σ1 and σ2 unknown, n1 or n2 30 σ1 and σ2 unknown, small samples Where t?/2 has (n1 + n2 – 2) ., and ? ? ? ?2nns1ns1ns21222211p ??????? ? ? ?21p2121n1n1sμμxxz?????The test statistic for μ1 – μ2 is: * Business Statistics: A DecisionMaking Approach, 6e 169。 2020 PrenticeHall, Inc. Chap 925 Two Population Means, Independent Samples Lower tail test: H0: μ1 – μ2 ? 0 HA: μ1 – μ2 0 Upper tail test: H0: μ1 – μ2 ≤ 0 HA: μ1 – μ2 0 Twotailed test: H0: μ1 – μ2 = 0 HA: μ1 – μ2 ≠ 0 ? ?/2 ?/2 ? z? z?/2 z? z?/2 Reject H0 if z z? Reject H0 if z z? Reject H0 if z z?/2 or z z?/2 Hypothesis tests for μ1 – μ2 Business Statistics: A DecisionMaking Approach, 6e 169。 2020 PrenticeHall, Inc. Chap 926 Pooled sp t Test: Example You’re a financial analyst for a brokerage firm. Is there a difference in dividend yield between stocks listed on the NYSE amp。 NASDAQ? You collect the following data: NYSE NASDAQ Number 21 25 Sample mean Sample std dev Assuming equal variances, is there a difference in average yield (? = )? Business Statistics: A DecisionMaking Approach, 6e 169。 2020 PrenticeHall, Inc. Chap 927 Calculating the Test Statistic ? ? ? ? ? ? ? ? 1 . 2 2 5 6225211 . 1 61251 . 3 01212nns1ns1ns 2221222211p ?????????????? ? ? ? ? ?2 . 0 4 02512111 . 2 2 5 602 . 5 33 . 2 7n1n1sμμxxz21p2121 ??????????The test statistic is: Business Statistics: A DecisionMaking Approach, 6e 169。 2020 PrenticeHall, Inc. Chap 928 Solution H0: μ1 μ2 = 0 . (μ1 = μ2) HA: μ1 μ2 ≠ 0 . (μ1 ≠ μ2) ? = df = 21 + 25 2 = 44 Critical Values: t = 177。 Test Statistic: Decision: Conclusion: Reject H0 at ? = There is evidence of a difference in means. t 0 .025 Reject H
點(diǎn)擊復(fù)制文檔內(nèi)容
教學(xué)課件相關(guān)推薦
文庫(kù)吧 www.dybbs8.com
備案圖片鄂ICP備17016276號(hào)-1