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In its monthly report, the local animal shelter states that it currently has 24 dogs and 18 cats available for adoption. Eight of the dogs and 6 of the cats are male Find each of the following conditional probabilities if an animal is selected at random: a) The pet is male, given that it is a cat. b) The pet is a cat, given that it is female. c) The pet is female, given that it is a dog.

Short Answer

Expert verified
a) \( \frac{1}{3} \); b) \( \frac{3}{7} \); c) \( \frac{2}{3} \).

Step by step solution

01

Identify the Total Number of Each Animal and Gender

First, we need to establish the total number of pets, the total number of cats and dogs, and the number of male and female cats and dogs. We have 24 dogs and 18 cats. Of the dogs, 8 are male, so there are 24 - 8 = 16 female dogs. Of the cats, 6 are male, so there are 18 - 6 = 12 female cats.
02

Calculate Conditional Probability a

For the probability that a pet is male given that it is a cat, we use the formula: \( P( ext{Male} \, | \, ext{Cat}) = \frac{P( ext{Male} \, ext{and} \, ext{Cat})}{P( ext{Cat})} \). We have 6 male cats and 18 total cats, so \( P( ext{Male} \, | \, ext{Cat}) = \frac{6}{18} = \frac{1}{3} \).
03

Calculate Conditional Probability b

For the probability that the pet is a cat given that it is female, we use: \( P( ext{Cat} \, | \, ext{Female}) = \frac{P( ext{Cat} \, ext{and} \, ext{Female})}{P( ext{Female})} \). We have 12 female cats and a total of 16 + 12 = 28 female animals. Thus, \( P( ext{Cat} \, | \, ext{Female}) = \frac{12}{28} = \frac{3}{7} \).
04

Calculate Conditional Probability c

For the probability that the pet is female given that it is a dog, we use: \( P( ext{Female} \, | \, ext{Dog}) = \frac{P( ext{Female} \, ext{and} \, ext{Dog})}{P( ext{Dog})} \). We have 16 female dogs and 24 total dogs, thus, \( P( ext{Female} \, | \, ext{Dog}) = \frac{16}{24} = \frac{2}{3} \).

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Key Concepts

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

Probability Theory
Conditional probability is a fundamental concept in probability theory. It helps us understand how the likelihood of an event changes when we have additional information. In simple terms, it is the probability of an event happening given that another event has already occurred.

For example, in our exercise, we are finding probabilities based on the condition that an animal is either male or female. The notation for conditional probability is typically shown as \( P(A \mid B) \), which reads as "the probability of A given B". Here, \( A \) and \( B \) are two events. The formula used is:
  • \( P(A \mid B) = \frac{P(A \text{ and } B)}{P(B)} \)
This formula shows the probability of both events A and B happening together divided by the probability of B, the event we're conditioning on.

By applying this to different scenarios, like determining the probability of selecting a male cat among all cats, we can make more informed predictions, thus understanding our datasets better.
Statistics Education
Understanding conditional probability is an essential part of statistics education. It is not just about rote computation but also about grasping the concepts to make meaningful analyses.

Students often encounter challenges because probability can be abstract, and datasets can seem too complex. However, exercises like these break down problems into understandable steps. The conditioned event frames probability in everyday contexts, such as determining a characteristic of an animal depending on its gender.

To strengthen your grasp on statistics, remember these key points:
  • Practice breaking down problems into smaller, manageable parts.
  • Use real-life examples to relate abstract concepts to tangible scenarios.
  • Visualize problems using diagrams or charts to see relationships between different data points.
These strategies can help demystify statistics and make it a more approachable and enjoyable subject.
Gender Analysis in Statistics
Gender analysis in statistics involves examining how different variables interact with gender. It plays a crucial role in understanding societal patterns and trends. In our exercise, we look at animals' availability for adoption and explore how gender affects these probabilities.

Such analysis can provide insights into broader gender-related issues. For instance, if a shelter consistently has more male dogs but female cats, a statistical study could explore factors leading to such demographics.

Questions you might consider in gender analysis include:
  • What are the underlying reasons for gender imbalances in certain datasets?
  • How do gender-based probabilities influence decision-making processes?
  • What impact could interventions have to address identified imbalances?
By analyzing statistical data through the lens of gender, decision-makers can tailor approaches more effectively and consciously consider how gender influences outcomes.

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Most popular questions from this chapter

A university requires its biology majors to take a course called BioResearch. The prerequisite for this course is that students must have taken either a Statistics course or a computer course. By the time they are juniors, \(52 \%\) of the Biology majors have taken Statistics, \(23 \%\) have had a computer course, and \(7 \%\) have done both. a) What percent of the junior Biology majors are ineligible for BioResearch? b) What's the probability that a junior Biology major who has taken Statistics has also taken a computer course? c) Are taking these two courses disjoint events? Explain. d) Are taking these two courses independent events? Explain.

Dan's Diner employs three dishwashers. Al washes \(40 \%\) of the dishes and breaks only \(1 \%\) of those he handles. Betty and Chuck each wash \(30 \%\) of the dishes, and Betty breaks only \(1 \%\) of hers, but Chuck breaks \(3 \%\) of the dishes he washes. (He, of course, will need a new job soon. ....) You go to Dan's for supper one night and hear a dish break at the sink. What's the probability that Chuck is on the job?

Employment data at a large company reveal that \(72 \%\) of the workers are married, that \(44 \%\) are college graduates, and that half of the college grads are married. What's the probability that a randomly chosen worker a) is neither married nor a college graduate? b) is married but not a college graduate? c) is married or a college graduate?

Real estate ads suggest that \(64 \%\) of homes for sale have garages, \(21 \%\) have swimming pools, and \(17 \%\) have both features. What is the probability that a home for sale has a) a pool or a garage? b) neither a pool nor a garage? c) a pool but no garage?

A company manufacturing electronic components for home entertainment systems buys electrical connectors from three suppliers. The company prefers to use supplier A because only \(1 \%\) of those connectors prove to be defective, but supplier A can deliver only \(70 \%\) of the connectors needed. The company must also purchase connectors from two other suppliers, \(20 \%\) from supplien \(B\) and the rest from supplier \(\mathrm{C}\). The rates of defective connectors from \(\mathrm{B}\) and \(\mathrm{C}\) are \(2 \%\) and \(4 \%\), respectively. You buy one of these components, and when you try to use it you find that the connector is defective. What's the probability that your component came from supplier A?

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