Table of contents

1. Intro to Stats and Collecting Data55m
2. Describing Data with Tables and Graphs1h 55m
3. Describing Data Numerically1h 45m
4. Probability2h 16m
5. Binomial Distribution & Discrete Random Variables2h 33m
6. Normal Distribution and Continuous Random Variables1h 38m
7. Sampling Distributions & Confidence Intervals: Mean1h 53m
8. Sampling Distributions & Confidence Intervals: Proportion1h 12m
- Sampling Distribution of Sample Proportion
  29m
- Confidence Intervals for Population Proportion
  42m
9. Hypothesis Testing for One Sample2h 19m
10. Hypothesis Testing for Two Samples3h 22m
11. Correlation1h 6m
12. Regression1h 4m
13. Chi-Square Tests & Goodness of Fit1h 20m
14. ANOVA1h 0m

5. Binomial Distribution & Discrete Random Variables

Binomial Distribution

Statistics

5. Binomial Distribution & Discrete Random Variables

Binomial Distribution

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1:44 minutes

Problem 4.1.21b

Textbook Question

Finding Probabilities Use the probability distribution you made in Exercise 19 to find the probability of randomly selecting a household that has (b) two or more HD televisions

Verified step by step guidance

Step 1: Recall the probability distribution created in Exercise 19. This distribution should list the number of HD televisions in a household (e.g., 0, 1, 2, etc.) along with their corresponding probabilities.

Step 2: Identify the probabilities associated with households that have two or more HD televisions. This means you need to consider the probabilities for 2, 3, and any higher numbers of HD televisions (if applicable).

Step 3: Add the probabilities for all these cases (e.g., P(X = 2), P(X = 3), etc.). Use the formula: \( P(X \geq 2) = P(X = 2) + P(X = 3) + \dots \).

Step 4: Ensure that the sum of all probabilities in the distribution equals 1. This is a good way to verify that the distribution is valid and that no probabilities are missing.

Step 5: The result of the summation from Step 3 gives the probability of randomly selecting a household with two or more HD televisions.

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Key Concepts

Here are the essential concepts you must grasp in order to answer the question correctly.

Probability Distribution

A probability distribution is a mathematical function that provides the probabilities of occurrence of different possible outcomes in an experiment. It can be discrete, where outcomes are distinct and countable, or continuous, where outcomes can take any value within a range. Understanding how to construct and interpret a probability distribution is essential for calculating probabilities related to specific events, such as selecting households with certain characteristics.

Random Selection

Random selection refers to the process of choosing individuals or items from a larger population in such a way that each member has an equal chance of being selected. This concept is crucial in statistics as it helps ensure that the sample is representative of the population, allowing for valid inferences to be made. In the context of the question, it implies that the households are chosen without bias, which is important for accurate probability calculations.

Cumulative Probability

Cumulative probability is the probability that a random variable takes on a value less than or equal to a specific value. In the context of the question, finding the probability of selecting a household with two or more HD televisions involves calculating the cumulative probability for that category. This concept helps in understanding how probabilities accumulate across different outcomes, which is essential for answering questions about ranges or groups of outcomes.

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Textbook Question

Forty-nine percent of U.S. adults think that human activity such as burning fossil fuels contributes a great deal to climate change. You randomly select 25 U.S. adults. Find the probability that the number who think that human activity contributes a great deal to climate change is (b) between 8 and 11, inclusive,

In Exercises 1–7, consider a grocery store that can process a total of four customers at its checkout counters each minute.

The mean number of customers who arrive at the checkout counters each minute is 4. Create a Poisson distribution with mu = 4 for x = 0 to 20. Compare your results with the histogram shown at the upper right.

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Textbook Question

Finding Probabilities Use the probability distribution you made in Exercise 19 to find the probability of randomly selecting a household that has (a) one or two HD televisions

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Textbook Question

Finding Probabilities Use the probability distribution you made in Exercise 19 to find the probability of randomly selecting a household that has (c) from one to three HD televisions,

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Textbook Question

Finding Probabilities Use the probability distribution you made in Exercise 19 to find the probability of randomly selecting a household that has (d) at most two HD televisions.

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Textbook Question

In Exercises 1–7, consider a grocery store that can process a total of four customers at its checkout counters each minute.

The mean number of arrivals per minute is four. Find the probability that

a. three, four, or five customers will arrive during the third minute.

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Textbook Question

An online magazine finds that the mean number of typographical errors per page is five. Find the probability that the number of typographical errors found on any given page is (a) exactly five, (b) less than five, and (c) exactly zero.

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