PPT-Section 6.5 Paired Difference in Means Paired Data or Separate Samples?

Section 65 Paired Difference in Means Paired Data or Separate Samples Should data from the following situation be analyzed as paired data or separate samples Paired Data Separate Samples To study the effect of sitting with a laptop computer on ones lap on scrotal temperature 29 men have their scrotal temperature tested before and then after sitting with a laptop for one hour. The square root of the pooled variance is called the pooled standard deviation deviation standard Pooled Example Male and Female Sleep Times Question How much difference is there between how long female and male students slept the previous night Da . To test claims about inferences for two sample means from matched-pair tests or blocked samples, under specific conditions. 8.3: Paired t-Test. Data are . paired. . when the observations are collected in pairs or the observations in one group are naturally related to observations in the other group.. Doctors studying healthy subjects measured myocardial blood flow (MBF) during bicycle exercise before and after giving the subjects a dose of caffeine that was equivalent to drinking two cups of coffee.. 1 : Paired t - test Research question type: Difference between (comparison of) two related ( paired , repeated or matched ) variables What kind of variables? Continuous ( scale/interval/ratio ) http://www.xkcd.com/892/. 1. http://www.xkcd.com/892/. https://www.cartoonstock.com/directory/s/statistics.asp. Notation. Mean . Variance. SD. Population. 1. μ. 1. . 1. Population 2. μ. 2. . Working with Paired . Passages - . Leaning in to . Get the . Learning Out . What is a Paired Passage?. Two passages about the same subject or with a common . theme or author. . After reading, students are asked questions about each individual passage as well as questions that incorporate both passages. Section 1:Why run a paired reading scheme? 2 Section 2: Impact and outcomes 3 Impact on literacy/English attainment Impact on attitudes behaviour and social skills Section 3: Pra Paired Difference in Means. Outline. Paired data. Confidence interval for difference in means based on paired data. Hypothesis test for difference in means based on paired data. Paired Data. Data . are . Testing Dimensions. Studying attributes of items in a . cultural domain. Free listing is a way to define the contents of a . domain. . Pile . sorts and triad tests are ways to measure . similarity. . Data: One Quantitative . Variable. Chapter 7. Introduction. The . paired datasets . in . this chapter . have one . pair. of . quantitative response . values for each observational unit. . . This allows for a built-in . Paired Difference in Means. Outline. Paired data. Confidence interval for difference in means based on paired data. Hypothesis test for difference in means based on paired data. Paired Data. Data . are . Chow, Ph.D. . Senior Scientist and Professor. Statistics Department . University Park. November 8. , 2016. CTSI BERD Research Methods Seminar Series. Basic statistical concepts . (from Stat I). Descriptive statistics (numeric/graphical). Means. Match Pair Designs. Objectives. Analyze the distribution of differences in a paired data set using graphs and summary statistics. Construct and interpret a confidence interval for a mean difference. Types of Two-Sample Tests. Independent test . –. two conditions are comprised of different elements or subjects . Example: comparing children and adults on a task. Paired test . – two conditions are comprised of the same elements or subjects; same observation is measured under different testing conditions. .