Wednesday, August 11 (131 minutes)
Tuesday, September 30: 3.1 Describing Relationships
Read 141
Why do we study relationships between two variables?
To make predictions, to explain phenomena
Read 143–144
What is the difference between an explanatory variable and a response variable?
• on page 143, describe how we used these principles in chapters 1-2
Read 145–149 (skim) Scatterplots only choice for displaying rel. between two Q variables
How do you know which variable to put on which axis? Where do you start each axis?
Not necessarily at (0,0)!
What is the easiest way to lose points when making a scatterplot? (833)
[pic]
Alternate Example: Track and Field Day! The table below shows data for 12 students in a statistics class. Each member of the class ran a 40-yard sprint and then did a long jump (with a running start). Make a scatterplot of the relationship between sprint time (in seconds) and long jump distance (in inches).
|Sprint time (s) |5.41 |5.05 |7.01 |7.17 |
|Intro |Describes the context of the research |Introduces the context of the |Introduces the context of |Briefly describes the |
| |Has a clearly stated question of interest |research and has a specific |the research and has a |context of the |
| |Provides a hypothesis about the answer to the|question of interest |specific question of |research |
| |question of interest |Suggests hypothesis OR has |interest OR has question of | |
| |Question of interest is of appropriate |appropriate difficulty |interest and a hypothesis | |
| |difficulty | | | |
|Data Collection |Method of data collection is clearly |Method of data collection is |Method of data collection is|Some evidence of data |
| |described |clearly described |described |collection |
| |Includes appropriate randomization |Some effort is made to incorporate|Some effort is made to | |
| |Describes efforts to reduce bias, |principles of good data collection|incorporate principles of | |
| |variability, confounding |Quantity of data is appropriate |good data collection | |
| |Quantity of data collected is appropriate | | | |
|Graphs and Summary |Raw data is included in a two-way table |Appropriate graphs are included |Graphs and summary |Graphs or summary |
|Statistics |(categorical data) or in two lists |(to help answer the question of |statistics are included |statistics are |
| |(quantitative data) |interest) | |included |
| |Appropriate graphs are included |Graphs are neat, clearly labeled, | | |
| |Graphs are neat, easy to compare and clearly |and easy to compare | | |
| |labeled, including clear identification of |Appropriate summary statistics or | | |
| |treatments |raw data are included | | |
| |Appropriate summary statistics are included | | | |
| |in discussion (e.g., percentages for | | | |
| |categorical data, means for quantitative | | | |
| |data) | | | |
|Conclusions |Uses the results of the study to correctly |Makes a correct conclusion |Makes a partially correct |Makes a conclusion |
| |answer question of interest |Discusses what inferences are |conclusion | |
| |Discusses what inferences are appropriate |appropriate or shows good evidence|Shows some evidence of | |
| |based on study design |of critical reflection |critical reflection | |
| |Shows good evidence of critical reflection | | | |
| |(discusses possible errors, shortcomings, | | | |
| |limitations, alternate explanations, etc.) | | | |
|Poster, |Has a clear, holistic understanding of the |Has a clear, holistic |The poster and oral |Communication and |
|Presentation, & |project |understanding of the project, but |presentation have several |organization are poor |
|Communi-cation |Poster is well organized, neat and easy to |poster is unorganized, lacks |problems | |
| |read |pictures, isn’t visually appealing| | |
| |Poster included pictures of data collection |or oral presentation is not | | |
| |in progress and is visually appealing |organized | | |
| |Oral presentation is well organized | | | |
*Note: It is possible to receive a score of 0 in any of the categories.
-----------------------
Predictor Coef SE Coef T P
Constant 1.00208 0.04511 22.21 0.000
Mentos 0.07083 0.01228 5.77 0.000
S = 0.0672442 R-Sq = 60.2% R-Sq(adj) = 58.4%
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