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Women's Rights A 2017 Pew Research poll asked people if they agreed with this statement: The United States hasn't gone far enough when it comes to giving women equal rights with men. \(42 \%\) of men agreed with the statement and \(57 \%\) of women agreed with the statement. Suppose these are accurate percentages. Now suppose a random man and woman meet. a. What is the probability that they both agree with the statement? b. What is the probability that neither believes with the statement? c. What is the probability that at least one of them agrees with the statement? d. What is the probability that only one of them agrees with the statement?

Short Answer

Expert verified
a. The probability that they both agree with the statement is approximately 0.2394. b. The probability that neither agrees with the statement is approximately 0.24874. c. The probability that at least one of them agrees with the statement is approximately 0.75126. d. The probability that only one of them agrees with the statement is approximately 0.5124.

Step by step solution

01

Probability Both Agree

To find the probability that they both agree with the statement, multiply the probability that the man agrees (0.42) by the probability that the woman agrees (0.57). This can be mathematically expressed as \(P(\text{Both Agree}) = P(\text{Man Agrees}) \times P(\text{Woman Agrees}) = (0.42) \times (0.57) = 0.2394\).
02

Probability Neither Agrees

To calculate the probability neither agrees, we need to find the complement of each probability (i.e., the probability of not agreeing with the statement) and then multiply those probabilities together. Mathematically, \(P(\text{Neither Agrees}) = [1-P(\text{Man Agrees})] \times [1-P(\text{Woman Agrees})] = (1-0.42) \times (1-0.57) = 0.578 \times 0.43 = 0.24874\).
03

Probability at Least One Agrees

The probability that at least one of them agrees can be found by subtracting the probability that neither of them agrees from 1, because these are complementary events. Mathematically, \(P(\text{At least One Agrees}) = 1 - P(\text{Neither Agrees}) = 1 - 0.24874 = 0.75126\).
04

Probability Only One Agrees

The probability only one agrees is the sum of the probability the man agrees and the woman does not and the probability the woman agrees and the man does not. This can be mathematically represented as \(P(\text{Only One Agrees}) = P(\text{Man Agrees and Woman Doesn't}) + P(\text{Woman Agrees and Man Doesn't}) = (0.42 \times (1-0.57)) + (0.57 \times (1-0.42)) = 0.1806 + 0.3318 = 0.5124\).

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Key Concepts

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

Probability Calculations
Understanding probability calculations is essential for interpreting data and predicting outcomes in various fields, from statistics to everyday decision-making. Let's look at how these were used in the context of the exercise.

To calculate the probability of two independent events both occurring, you simply multiply the probability of each event happening. For instance, in our exercise where a man and a woman each have a certain probability of agreeing with a statement, the chance that they both agree is found by multiplying those individual probabilities.

Mathematically, it's expressed as: \[ P(\text{Both Agree}) = P(\text{Man Agrees}) \times P(\text{Woman Agrees}) \]
This calculation assumes that the man's opinion does not affect the woman's and vice versa, which is why the events are considered independent.
Continuous practice of similar problems and real-life situations can strengthen your understanding of probability calculations.
Complementary Events
Complementary events in probability are a pair of outcomes that are the only two possible outcomes and that cannot both happen at the same time. Essentially, one event is the 'opposite' of the other. When dealing with complementary events, the sum of their probabilities is always 1.

In the case of our exercise, we considered the event where neither a man nor a woman agrees with a statement. The complementary event of agreeing would be not agreeing, and vice versa. To find the probability of at least one person agreeing, which encompasses both the event of both agreeing and only one party agreeing, we subtract the probability of neither agreeing from 1.

Mathematically, this is represented as: \[ P(\text{At least One Agrees}) = 1 - P(\text{Neither Agrees}) \]
Having a clear grasp of complementary events allows you to solve a wide array of problems without direct data for every possible outcome.
Statistical Analysis
Statistical analysis involves collecting, exploring, and presenting large amounts of data to discover underlying patterns and trends. In our exercise, statistical analysis is implied in the interpretation of polling data to determine the likelihood of various opinions on women's rights. The probabilities calculated from the poll percentages provide insights that could have implications in social sciences and policy-making, among other areas.

For a full statistical analysis, one might delve deeper into the demographics, considering other variables such as age, education, and geographic location, which require more complex statistical techniques beyond the scope of simple probability calculations.

Learning to connect the outcomes of probability calculations to real-world contexts is a valuable skill fostered by regular statistical analysis practice.

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Most popular questions from this chapter

Online Dating A 2016 Pew Research poll reported that \(27 \%\) of young adults aged 18 to 24 had used an online dating site. Assume the percentage is accurate. a. If two young adults are randomly selected, what is the probability that both have used an online dating site? b. If the two young adults chosen were Facebook friends, explain why this would not be considered independent with regard to online dating.

One of the authors did a survey to determine the effect of students changing answers while taking a multiple-choice test on which there is only one correct answer for each question. Some students erase their initial choice and replace it with another. It turned out that \(61 \%\) of the changes were from incorrect answers to correct and that \(26 \%\) were from correct to incorrect. What percentage of changes were from incorrect to incorrect?

A true/false test has 20 questions. Each question has two choices (true or false), and only one choice is correct. Which of the following methods is a valid simulation of a student who guesses randomly on each question. Explain. (Note: there might be more than one valid method.) a. Twenty digits are selected using a row from a random number table. Each digit represents one question on the test. If the number is even the answer is correct. If the number is odd, the answer is incorrect. b. A die is rolled 20 times. Each roll represents one question on the test. If the die lands on a 6 , the answer is correct; otherwise the answer is incorrect. c. A die is rolled 20 times. Each roll represents one question on the test. If the die lands on an odd number, the answer is correct. If the die lands on an even number, the answer is incorrect.

A Monopoly player claims that the probability of getting a 4 when rolling a six-sided die is \(1 / 6\) because the die is equally likely to land on any of the six sides. Is this an example of an empirical probability or a theoretical probability? Explain.

Online Shopping A 2016 Pew Research poll reported that \(80 \%\) of Americans shop online. Assume the percentage is accurate. a. If two Americans are randomly selected, what is the probability that both shop online? b. If the two Americans selected are a married couple, explain why they would not be considered independent with regard to online shopping.

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