Publications by Mr. Hern
Level 2 Lab 4.3 Key
In this lab, we use the BullRider dataset to continue to explore the process of statistical inference and hypothesis testing; specifically whether the point totals for individual riders in two seasons differed. We will again have the opportunity to create a calculated difference field to use for paired t-testing. Research Question Did bullriders h...
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Chapter 4.1-4.2 Review Worksheet Key
Introduction Because of the “scavenger hunt” nature of the progression on the first page of the worksheet, it is best done manually. This key will cover questions 2, 3 & 4 as they are ideally suited for RStudio. Question 2 Overview You have just taken ownership of a pizza shop. The previous owner told you that you would save money if you bough...
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When Pi IS the Mode
In this study, we use the pialamode dataset to explore the possibility of pi as the mode instead of just some French words that are misused. Research Question Is it possible for the mathematical constant pi to BE the mode instead of just “a la?” Preparation First, we import the pialamode dataset and name it “pi.” If needed, we can review ...
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Lesson Check 3.3 Key
Introduction No dataset is necessary in this lesson check; all questions supply the necessary information. Question 1 A sample can offer us important insights into a population. What is our standard for obtaining a representative sample? Question 1 answer: All of the listed methods are possibilities, but the standard for a representative sample is...
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Homework 3.3 Key
Introduction No dataset is necessary in this lesson check; all questions supply the necessary information. Question 1 State police set up a roadblock on a major highway at 7 am to estimate the percentage of cars with up-to-date registration, insurance and safety inspection stickers. This morning, they find problems with about 10% of the cars they ...
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Homework 4.1 Key
Introduction One of the scenarios presented involves a yogurt dataset, recreated here so that we might use alternative means of calculating the requested figures. The remaining questions supply the relevant information without raw data. Question 1 A researcher randomly samples 100 people in the restaurant business. He graphs the salary distributio...
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Lesson Check 4.1 Key
Introduction No dataset is necessary in this lesson check; the majority of the questions focus on a potato chips (yay!) inquiry with each question supplying the necessary information. Question 1 What critical value of t would you use with 10 degrees of freedom to construct a 95% confidence interval? (report the positive value to 3 decimal places) ...
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Homework 4.2 Key
Introduction No dataset is necessary in this homework; the bulk of the questions focus on an FAA flight time study with each question supplying the relevant information. Question 1 What is the standard value of significance we choose to use in this course? Question 1 answer: In this course we use \(\alpha\) = 0.05, or 5 percent. Question 2 A medi...
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Lesson Check 4.2 Key
Introduction No dataset is necessary in this lesson check; the bulk of the questions focus on a pharmacy experiment with each question supplying the necessary information. Question 1 A necessary condition for a one-sample t-test is that the sample must consist of “independent” observations. What does this mean? Question 1 answer: There must be...
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Lesson Check 4.3 Key
Shooting and Chewing Does chewing gum make your accuracy change while target shooting? I created a dataset mirroring the “shooting and chewing” (“chooting and shewing?”) in the homework to enable the use of R to respond to the questions. An additional difference column was required to serve as the primary variable of interest. chewing <- re...
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