a scatter diagram Flashcards","topicId":"0ed78d1f-35d9-4b4c-b6b7-1f0d5d8dda0c","topicSlug":"interpret-a-scatter-diagram","cards":[{"id":"327abd71-d945-4c5f-8bd6-d1caf94ed6df","cardType":"basic","front":"For paired values $x$ and $y$, where is the observation plotted?","back":"At coordinates $(x,y)$.","points":1,"mcqOptions":null},{"id":"5c3953ba-db2e-440a-aa16-6804ad8b7b4d","cardType":"basic","front":"Which variable is usually plotted on the horizontal axis?","back":"The explanatory variable.","points":1,"mcqOptions":null},{"id":"1fb3b192-8c45-4585-b564-62daf4978f37","cardType":"basic","front":"What does a positive association indicate?","back":"Larger values of one variable tend to occur with larger values of the other.","points":1,"mcqOptions":null},{"id":"b5f3059c-22f1-4618-9dfa-c1f750939885","cardType":"basic","front":"What does a negative association indicate?","back":"Larger values of one variable tend to occur with smaller values of the other.","points":1,"mcqOptions":null},{"id":"5b3ac8ba-9d52-40f4-b2dc-20428f0eed79","cardType":"basic","front":"How do you distinguish a strong association from a weak one?","back":"

Strong: points lie close to the pattern.
Weak: points are widely scattered.

","points":3,"mcqOptions":null},{"id":"2945e579-aaa5-460c-a17c-4087c8fe93cd","cardType":"cloze","front":"A [ ] association follows an approximately straight-line pattern; a non-linear association follows a curved or non-straight pattern.","back":"A linear association follows an approximately straight-line pattern; a non-linear association follows a curved or non-straight pattern.","points":null,"mcqOptions":null},{"id":"435511d7-4152-4c2e-bd7f-1603b775176b","cardType":"cloze","front":"A linear association follows an approximately straight-line pattern; a [ ] association follows a curved or non-straight pattern.","back":"A linear association follows an approximately straight-line pattern; a non-linear association follows a curved or non-straight pattern.","points":null,"mcqOptions":null},{"id":"134844ab-8bc1-455b-94d2-ea46457e8fa1","cardType":"basic","front":"Why does a steep regression line not necessarily show a strong association?","back":"Strength depends on closeness to the pattern, not its steepness.","points":2,"mcqOptions":null},{"id":"d94d15a2-62c5-4181-a945-201e2e56b029","cardType":"basic","front":"What makes an observation influential?","back":"Its inclusion substantially changes the fitted model.","points":1,"mcqOptions":null},{"id":"17c3e906-2a37-4793-9b09-c3e001b89578","cardType":"basic","front":"Why can a point with an unusual $x$-value be especially influential?","back":"It may pull the regression line towards itself.","points":2,"mcqOptions":null},{"id":"cd4e9af5-78e7-4f80-9d1a-95f7aa5802ff","cardType":"basic","front":"Why should an outlier not be discarded automatically?","back":"It may reflect error, unusual circumstances, a missing variable or natural variation.","points":2,"mcqOptions":null},{"id":"94e824bd-802c-4dff-a524-489f1c30060b","cardType":"basic","front":"Why does a strong association not prove causation?","back":"A lurking variable, reverse causation or coincidence may explain it.","points":2,"mcqOptions":null},{"id":"f148a500-72ce-4615-a7b4-25acd4232740","cardType":"cloze","front":"In $y=a+bx$, $a$ predicts $y$ when $\\text{[...]}$, while $b$ predicts the change in $y$ for a one-unit increase in $x$.","back":"In $y=a+bx$, $a$ predicts $y$ when $\\boxed{x=0}$, while $b$ predicts the change in $y$ for a one-unit increase in $x$.","points":null,"mcqOptions":null},{"id":"cfef813c-604f-42be-b562-343d994fb6d2","cardType":"cloze","front":"In $y=a+bx$, $a$ predicts $y$ when $x=0$, wh

2.2.6 Interpret a scatter diagram Flashcards

2.2.6 Interpret a scatter diagram Flashcards