/*! 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} Q. 20 SRS of students? At a party, the... [FREE SOLUTION] | 91影视

91影视

Log out

Learning Materials

Features

Discover

Chapter 4: Q. 20 (page 238)

SRS of students? At a party, there are 30 students over age 21 and 20students underage21. You choose at random 3 of those over 21 and separately choose at random 2 of those under 21 to interview about their attitudes toward alcohol. You have given every student at the party the same chance to be interviewed. Is your sample an SRS? Explain your answer.

Short Answer

Expert verified

The sample is not a SRS

Step by step solution

01

Given information 

We need to find whether the sample is SRS or not

02

Explanation

A sample of size nis used in simple random sampling, and each sample of size nhas an equal probability of being chosen.

In this scenario, the sample will include three students over the age of 21and two students under the age of 21, with the students being chosen at random from the age groups (over age 21and under age 21).

This sample, however, will not be a simple random sample, as some samples will have no probability of being chosen (for example, a sample of exclusive students over the age of 21), while others will have a possibility of being chosen.

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 91影视!

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

Sleepless nights How much sleep do high school students get on a typical

school night? A counselor designed a survey to find out. To make data collection easier,

the counselor surveyed the first 100students to arrive at school on a particular morning.

These students reported an average of 7.2 hours of sleep on the previous night.

a. What type of sample did the counselor obtain?

b. Explain why this sampling method is biased. Is7.2hours probably greater than or less

than the true average amount of sleep last night for all students at the school? Why?

Kissing the right way According to a newspaper article, 鈥淢ost people are kissing the

鈥榬ight way.鈥欌�� That is, according to a study, the majority of couples prefer to tilt their heads

to the right when kissing. In the study, a researcher observed a random sample of124

kissing couples and found that 8312466.9%of the couples tilted to the right. To

determine if these data provide convincing evidence that couples are more likely to tilt

their heads to the right, 100simulated SRSs were selected.

Each dot in the graph shows the number of couples that tilt to the right in a simulated SRS

of124couples, assuming that each couple has a 50%chance of tilting to the right.

a. Explain how the graph illustrates the concept of sampling variability.

b. Based on the data from the study and the results of the simulation, is there convincing

evidence that couples prefer to kiss the 鈥渞ight way鈥�? Explain your answer.

Sampling mall shoppers You may have seen the mall interviewer, clipboard in hand, approaching people passing by. Explain why even a large sample of mall shoppers would not provide a trustworthy estimate of the current unemployment rate in the city where the mall is located.

Rude surgeons, Is a friendly surgeon a better surgeon? In a study of more than 32,000

surgical patients from 7 different medical centers, researchers classified surgeons by the number of unsolicited complaints that had been recorded about their behavior. The researchers found that surgical complications were significantly more common in patients whose surgeons had received the most complaints, compared with patients whose surgeons had received the fewest complaints. What conclusion can we draw from this study? Explain your reasoning.

Initial public offerings (1.3) The business magazine Forbes reports that 4567companies sold their first stock to the public between 1990and 2000. The mean change in the stock price of these companies since the first stock was issued was +111%. The median change was -31%. Explain how this difference could happen.
See all solutions

Recommended explanations on Math Textbooks

Calculus

Read Explanation

Mechanics Maths

Read Explanation

Geometry

Read Explanation

Logic and Functions

Read Explanation

Statistics

Read Explanation

Pure Maths

Read Explanation
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.