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91Ó°ÊÓ

Sample Space. Choose a student at random from a large statistics class. Describe a sample space \(S\) for each of the following. (ln some cases, you may have some freedom in specifying \(S\).) (a) Does the student own a car or not? (b) What is the student's height in centimeters? (c) What are the last three digits of the student's cell phone number? (d) What is the student's birth month?

Short Answer

Expert verified
(a) \( \{ \text{Owns a Car}, \text{Does Not Own a Car} \} \); (b) \( [140, 200] \); (c) \( \{000, 001, \ldots, 999\} \); (d) \( \{ \text{Jan}, \ldots, \text{Dec} \} \).

Step by step solution

01

Define Sample Space for Car Ownership

To determine the sample space for whether a student owns a car, consider the options available. The student can either own a car or not. Thus, the sample space can be defined as \( S = \{ \text{Owns a Car}, \text{Does Not Own a Car} \} \).
02

Define Sample Space for Student's Height

Height can vary within a continuous range. For the student's height in centimeters, we assume a reasonable range for adult heights. Suppose the range is from 140 cm to 200 cm, the sample space is then an interval from 140 cm to 200 cm: \( S = [140, 200] \).
03

Define Sample Space for Last Three Digits of Cell Phone Number

Each digit in the last three digits can be any number from 0 to 9. Therefore, there are 1000 possible combinations (000 to 999). The sample space is \( S = \{ 000, 001, 002, \ldots, 998, 999 \} \).
04

Define Sample Space for Birth Month

There are 12 months in a year. Therefore, the sample space for a student’s birth month includes all 12 months: \( S = \{ \text{January}, \text{February}, \ldots, \text{December} \} \).

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Key Concepts

These are the key concepts you need to understand to accurately answer the question.

Statistics Education
Statistics education introduces students to the core concepts and applications of statistics, helping them understand how to collect, analyze, and interpret data. By working with problems involving sample spaces, students learn to identify possible outcomes in different scenarios. For example, when determining the sample space for whether a student owns a car, students are taught to recognize distinct outcomes, such as owning a car versus not owning one. This simple binary outcome is an entry-level concept that lays the foundation for more complex statistical analysis. As students progress, they tackle different types of data, moving from discrete data like yes/no questions to continuous data such as height. With continuous data, understanding sample spaces involves acknowledging ranges and intervals, such as heights from 140 cm to 200 cm. By grasping these foundational statistics concepts, students build the skills necessary for more advanced statistical techniques and real-world data interpretation.
Probability Concepts
Probability concepts are essential in understanding the likelihood of events occurring within a sample space. A sample space includes all possible outcomes of an experiment or event, and probability helps quantify the chance of each outcome taking place. For instance, when dealing with the last three digits of a student’s cell phone number, recognizing that there are 1000 possible combinations (from 000 to 999) helps students calculate the probability of picking a specific number. Since each number is equally likely, the probability of any single combination is 1 in 1000, emphasizing the uniform distribution of outcomes. Moreover, when considering car ownership, the probability is more straightforward, as each option (owns a car or does not) could be equally likely. Understanding these probability concepts aids students in making informed decisions based on likely outcomes, a valuable skill in both academia and everyday life.
Descriptive Statistics
Descriptive statistics involves summarizing and describing datasets to provide an understanding of their collective characteristics. It often uses measures such as mean, median, mode, and range to present data in an informative way. A practical application of descriptive statistics is in summarizing details about a group, like a statistics class. For instance, describing the sample space for students' birth months involves listing all 12 months, allowing for visualizing distribution patterns, such as which months are more or less common. This can guide more extensive data collection or analysis efforts. Another example is considering the heights of students. By knowing the range (140 cm to 200 cm), statistics can be used to calculate the average or spread of heights, providing a clear picture of physical characteristics in a population. These techniques offer invaluable insights and make complex datasets more approachable, equipping students with the ability to not only analyze data but also communicate findings effectively.

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Most popular questions from this chapter

Winning the ACC Toumament. The annual Atlantic Coast Conference men's basketball tournament has temporarily taken Joe's mind off of the Cleveland Indians. He says to himself, "I think that Notre Dame has probability \(0.05\) of winning. North Carolina's probability is twice Notre Dame's, and Duke's probability is four times Notre Dame's." (a) What are Joe's personal probabilities for North Carolina and Duke? (b) What is Joe's personal probability that 1 of the 12 teams other than Notre Dame, North Carolina, and Duke will win the tourmament?

First digits again. A crook who never heard of Benford's law might choose the first digits of his faked invoices \(s o\) that all of \(1,2,3,4,5,6,7,8\), and 9 are equally likely. Call the first digit of a randomly chosen fake invoice \(W\) for short. (a) Write the probability distribution for the random variable W. (b) Find \(P(W \geq 6)\) and compare your result with the Benford's law probability from Example 12.7.

A basketball player shoots six free throws during a game. The sample space for counting the number she makes is (a) \(S=\) any number between 0 and 1 . (b) \(S=\) whole numbers 0 to 6 . (c) \(S=\) all sequences of six hits or misses, like HMMHHH.

Four-of-a-Kind. You read online that the probability of being dealt four-of- akind in a five-card poker hand is 1/4165. Explain carefully what this means. In particular, explain why it does not mean that if you are dealt 4165 five- card poker hands, one will be four-of-a-kind.

Who gets interviewed? Abby, Deborah, Mei-Ling, Sam, and Roberto are students in a small seminar course. Their professor decides to choose two of them to interview about the course. To avoid unfairness, the choice will be made by drawing two names from a hat. (This is an SRS of size 2.) (a) Write down all possible choices of two of the five names. This is the sample space. (b) The random drawing makes all choices equally likely. What is the probability of each choice? (c) What is the probability that Mei-Ling is chosen? (d) Abby, Deborah, and Mei-Ling liked the course. Sam and Roberto did not like the course. What is the probability that both people selected liked the course?

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