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Last cigarette Take another look at the regression

Stats: Data and Models | 4th Edition | ISBN: 9780321986498 | Authors: Richard D. De Veaux, Paul F. Velleman, David E. Bock ISBN: 9780321986498 70

Solution for problem 47E Chapter 7

Stats: Data and Models | 4th Edition

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Stats: Data and Models | 4th Edition | ISBN: 9780321986498 | Authors: Richard D. De Veaux, Paul F. Velleman, David E. Bock

Stats: Data and Models | 4th Edition

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Problem 47E

Problem 47E

Last cigarette Take another look at the regression analysis of tar and nicotine content of the cigarettes in Exercise 43.

a) Write the equation of the regression line.

b) Estimate the Nicotine content of cigarettes with 4 milligrams of Tar.

c) Interpret the meaning of the slope of the regression line in this context.

d) What does the y-intercept mean?

e) If a new brand of cigarette contains 7 milligrams of tar and a nicotine level whose residual is -0.5 mg, what is the nicotine content?

Exercise 43:

Cigarettes Is the nicotine content of a cigarette related to the “tar”? A collection of data (in milligrams) on 29 cigarettes produced the scatterplot, residuals plot, and regression analysis shown:

a) Do you think a linear model is appropriate here? Explain.

b) Explain the meaning of R2 in this context.

Step-by-Step Solution:
Step 1 of 3

Memory and Forgetting External events Sensory memory Working memory (short term) Long term memory Sensory memory holds the words herd for a few short seconds and lets you register them. Researchers believe that there is a sense memory for each sense. (Auditory and visual are the most studied) Short-term memory is the active processing of information. It associates new and old information/solves problems Duration: longer than in sensory memory, rehearsal helps. Forgetting is decay, if not rehearsed it just fades away. Interference is being replaced by new info. Capacity: 7+/- rule (4+/- 1) at one point you can take on about 5-9 facts. Capacity can be increased by chunking- breaking things up into meaningful pieces for yourself Short term memory to working memory- they are not exactly interchangeable. Short term memory is simple memory process that come from rehearsal. Working memory is more effective because it is effortful/active. It deals with problem solving, reasoning, language comprehension, mental comparisons. Long-term memory extended period of time It last longer than 20 seconds in STM, its max duration is a life time. Encoding LTMs- making new info retrievable by transferring it to LTM. Maintenance rehearsal isn’t effective here (it’s not working hard enough) Elaborative rehearsal- focus on the meaning of the info/ relates it to things you already know. The best ways to do this are: put things in your own words, question the new info, think deeply, search for connections, and generate your own examples. Memory retrieval- bringing memories forward Importance of cues- clues, prompts, hints that help you recall. Cue failure can happen if the cues aren’t there or if they aren’t good enough. Serial positon effect- a words position in the list makes a difference. Primary- remembering words at the beginning. Recency- remembering the words at the end of a sequence. Forgetting encoding failure- it never got to LTM Decay theory is that memories we don’t use fade away. Not all researchers agree with this (Ex. Going back to your elementary school and having forgotten memories come back) Interference theory Motivated forgetting: suppression- “I’m not going to think about it” repression- happens unconsciously Misinformation effect happens when existing memories are altered when exposed to misleading info. False memories Schema- an organized cluster of information about a particular topic, like a script. (Like going to a restaurant and knowing the series of events or associating an office with books)

Step 2 of 3

Chapter 7, Problem 47E is Solved
Step 3 of 3

Textbook: Stats: Data and Models
Edition: 4
Author: Richard D. De Veaux, Paul F. Velleman, David E. Bock
ISBN: 9780321986498

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Last cigarette Take another look at the regression