/*! This file is auto-generated */ .wp-block-button__link{color:#fff;background-color:#32373c;border-radius:9999px;box-shadow:none;text-decoration:none;padding:calc(.667em + 2px) calc(1.333em + 2px);font-size:1.125em}.wp-block-file__button{background:#32373c;color:#fff;text-decoration:none} Problem 1 The survey students consisted of... [FREE SOLUTION] | 91Ó°ÊÓ

91Ó°ÊÓ

The survey students consisted of 169 females and 193 males. Find \(\hat{p},\) the proportion who are female.

Short Answer

Expert verified
\(\hat{p} = \frac{169}{362}\)

Step by step solution

01

Identify the total number of students

The total number of students is the sum of the number of males and females. Therefore, the total number of students is \(169 (females) + 193 (males) = 362\).
02

Calculate the proportion of females

The proportion \(\hat{p}\) is found by dividing the number of females by the total number of students. Therefore, \(\hat{p} = \frac{number \:of \:females}{total \:number \:of \:students} = \frac{169}{362}\).

Unlock Step-by-Step Solutions & Ace Your Exams!

  • Full Textbook Solutions

    Get detailed explanations and key concepts

  • Unlimited Al creation

    Al flashcards, explanations, exams and more...

  • Ads-free access

    To over 500 millions flashcards

  • Money-back guarantee

    We refund you if you fail your exam.

Over 30 million students worldwide already upgrade their learning with 91Ó°ÊÓ!

Key Concepts

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

Statistical Proportion
Statistical proportion is a fundamental concept in statistics that represents the relationship between a part and a whole. It indicates how a subset of data relates to the larger set. In the exercise, understanding proportions is critical when we want to know the fraction or percentage of a specific group within a survey.

For instance, if we're interested in determining the proportion of females in a survey group, we would divide the number of females by the total number of participants. The result gives us a clear picture of the weight or significance of that subgroup in the context of the entire population. This can be succinctly expressed using the formula:
\[\hat{p} = \frac{{\text{{number of items in subgroup}}}}{{\text{{total number of items in group}}}}\]
Using this formula, we can calculate proportions in various situations, such as assessing responses in a poll, analyzing demographic data, or simply determining the prevalence of a characteristic within a dataset.
Survey Analysis
Survey analysis involves collecting, reviewing, and interpreting data gathered from surveys to make informed decisions. In the provided exercise, survey analysis would consist of assessing the gender distribution of the survey participants. It's an essential tool in research as it provides insights into the surveyed population and helps validate hypotheses or inform policy and decision-making.

When conducting survey analysis, it's crucial to have a clear goal and understand the nature of the data collected. The analysis includes several steps such as data cleaning, coding responses, and using appropriate statistical techniques to summarize the information. In our example, we focused on a simple proportion calculation to understand the gender distribution, which is one of the most fundamental types of survey analysis.
Data Interpretation
Data interpretation is the process by which we make sense of numerical information to arrive at conclusions. It goes beyond mere calculation; it is about understanding what the numbers tell us about the real world. In the exercise, we've calculated the proportion of female survey respondents, but what does that number mean in context?

Interpreting this data could involve considering how the proportion of females compares to that of males and how these figures might relate to the topic of the survey. Also, the proportions could reflect or challenge assumptions about gender distribution in the area or population where the survey was conducted. Effective data interpretation requires critical thinking and the ability to place numerical results within a broader context to derive meaningful insights.

One App. One Place for Learning.

All the tools & learning materials you need for study success - in one app.

Get started for free

Most popular questions from this chapter

Draw any dotplot to show a dataset that is Approximately symmetric but not bell-shaped

Runs and Wins in Baseball In Exercise 2.136 on page 100 , we looked at the relationship between total hits by team in the 2010 season and division (NL or AL) in baseball. Two other variables in the BaseballHits dataset are the number of wins and the number of runs scored during the season. The dataset consists of values for each variable from all 30 MLB teams. From these data we calculate the regression line: $$ \widehat{\text { Wins }}=0.362+0.114(\text { Runs }) $$ (a) Which is the explanatory and which is the response variable in this regression line? (b) Interpret the intercept and slope in context. (c) The Oakland A's won 81 games while scoring 663 runs. Predict the number of games won by Oakland using the regression line. Calculate the residual. Were the A's efficient at winning games with 663 runs?

Presidential Elections In Example 2.43 on page \(123,\) we use the approval rating of a president running for re-election to predict the margin of victory or defeat in the election. We saw that the least squares line is \(\widehat{\text { Margin }}=-36.5+0.836(\) Approval \()\). Interpret the slope and the intercept of the line in context.

Two quantitative variables are described. Do you expect a positive or negative association between the two variables? Explain your choice. Amount of time spent studying and Grade on the exam

For each set of data in Exercises 2.43 to 2.46: (a) Find the mean \(\bar{x}\). (b) Find the median \(m\). (c) Indicate whether there appear to be any outliers. If so, what are they? \(\begin{array}{llllll} & 110, & 112, & 118, & 119, & 122, & 125, & 129,\end{array}\) \(\begin{array}{lll}135, & 138, & 140\end{array}\)

See all solutions

Recommended explanations on Math Textbooks

View all explanations

What do you think about this solution?

We value your feedback to improve our textbook solutions.

Study anywhere. Anytime. Across all devices.