Question

Find the sample proportion \(\hat{p}\). The survey included 43 students who smoke and 319 who don't. Find \(\hat{p},\) the proportion who smoke.

Short answer

The sample proportion of students who smoke is \(\hat{p} = \frac{43}{362}\)

Step-by-step solution

Identify the number of successes and total sample size

From the exercise, the number of successes (students who smoke) is 43 and the total sample size (students who smoke and don't smoke) is 43 + 319 = 362.

Calculate the sample proportion (\(\hat{p}\))

The sample proportion (\(\hat{p}\)) is obtained by dividing the number of successes by the total sample size. Thus, \(\hat{p} = \frac{43}{362}\)

Key concepts

Understanding Statistics

Statistics is a branch of mathematics that deals with the collection, analysis, interpretation, and presentation of numerical data. It is a fundamental tool used across various fields including science, business, and social sciences to make informed decisions based on data. In statistics, a sample is a subset of a population, which is a collection of subjects or items that one wants to make conclusions about. For instance, when assessing the smoking habits of college students, a researcher doesn't need to question every student but selects a sample that represents the broader population.

The aim is to derive meaningful insights from this sample that can be generalized to the whole population. Understanding sample properties, such as the sample proportion, is crucial in estimating characteristics of the total population. Correctly applying statistical methods ensures the accuracy of these estimates, which is why understanding the fundamental concepts like sample proportion is essential in the study of statistics.

The Essence of Survey Analysis

Survey analysis involves the examination and interpretation of survey data to discover patterns and trends. When conducting a survey for a specific characteristic, such as smoking status among students, it's important to ensure that the process is unbiased and the questions are structured in a way that elicits clear and honest responses. Analyzing survey data requires an understanding of the variables being measured. In our context, the variables are 'students who smoke' and 'students who don't smoke.'

Furthermore, the analysis must consider the reliability and validity of the data. Reliability refers to the consistency of the measurement, and validity talks about the accuracy of the measure in representing what it's supposed to. Thorough survey analysis involves computing various statistics, including sample proportions, to summarize the data and allow easy interpretation of the results. The sample proportion is, thus, a vital statistic in conveying the percentage of a particular attribute found in a sample.

Proportion Calculation Fundamentals

Proportion calculation is used to ascertain the ratio of a part to the whole. It is a straightforward yet powerful mathematical operation that can provide insights into the prevalence of a characteristic within a given sample or population. The sample proportion, denoted as \(\hat{p}\), is calculated by dividing the number of successes (instances of the characteristic of interest) by the total sample size.

In our specific case concerning the number of students who smoke, the sample proportion is obtained by dividing the number of students who smoke by the total number of students surveyed. As we've seen in the solution, with 43 smoking and 319 non-smoking students, the sample proportion calculation gives us \(\hat{p} = \frac{43}{362}\). This proportion is significant as it can be used to estimate the smoking rate among all students, not just those in the sample, assuming the sample is representative of the larger population. Grasping proportion calculations is essential for students and researchers alike, as they often serve as a basis for more complex statistical analysis.