/*! 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 70 Describe an association between ... [FREE SOLUTION] | 91影视

91影视

Log out

Learning Materials

Features

Discover

Chapter 1: Problem 70

Describe an association between two variables. Give a confounding variable that may help to account for this association. More ice cream sales have been linked to more deaths by drowning.

Short Answer

Expert verified
The statement demonstrates an association between ice cream sells and deaths by drowning. The likely confounding variable here is the 'weather' or more specifically, the 'summer season'. During summer, temperatures increase which boosts ice cream sales. Similarly, more people are likely to go swimming in the summer, increasing the risk of drowning incidents.

Step by step solution

01

Identification of the association

First, we identify the association in the exercise which is 'more ice cream sales have been linked to more deaths by drowning.' This means as ice cream sales increase, deaths by drowning increase.
02

Think of possible confounding variable

Next, we need to think of a confounding variable. This variable would explain why both ice cream sales and deaths by drowning increase. It has to be a variable that is capable of influencing both deaths by drowning and ice cream sales positively.
03

Identify confounding variable

The confounding variable in this case is likely 'weather', more specifically 'summer season'. During summer, temperatures are higher which leads to increased demand for ice cream. At the same time, in the summer people are more inclined to go swimming, which increases the likelihood of drowning incidents.

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

Interviewing the Film Crew on Hollywood Movies There were 136 movies made in Hollywood in 2011. Suppose that, for a documentary about Hollywood film crews, a random sample of five of these movies will be selected for in-depth interviews with the crew members. Assuming the movies are numbered 1 to \(136,\) use a random number generator or table to select a random sample of five movies by number. Indicate which numbers were selected. (If you want to know which movies you selected, check out the dataset HollywoodMovies2011.)

Strawberry Fields A strawberry farmer has planted 100 rows of plants, each 12 inches apart, and there are about 300 plants in each row. He would like to select a random sample of 30 plants to estimate the average number and weight of berries per plant. (a) Explain how he might choose the specific plants to include in the sample. (b) Carry out your procedure from (a) to identify the first three plants selected for the sample.

Sampling Some Hardee's Restaurants The Hardee's Restaurant chain has about 1900 quickserve restaurants in 30 US states and 9 countries. \({ }^{28}\) Suppose that a member of the Hardee's administration wishes to visit six of these restaurants, randomly selected, to gather some first-hand data. Suppose the restaurants are numbered 1 to \(1900 .\) Use a randomnumber generator or table to select the numbers for 6 of the restaurants to be in the sample.

Do Antidepressants Work? Following the steps below, design a randomized comparative experiment to test whether fluoxetine (the active ingredient in Prozac pills) is effective at reducing depression. The participants are 50 people suffering from depression and the response variable is the change on a standard questionnaire measuring level of depression. (a) Describe how randomization will be used in the design. (b) Describe how a placebo will be used. (c) Describe how to make the experiment doubleblind.

Does alcohol increase reaction time? Design a randomized experiment to address this question using the method described in each case. Assume the participants are 40 college seniors and the response variable is time to react to an image on a screen after drinking either alcohol or water. Be sure to explain how randomization is used in each case. (a) A randomized comparative experiment with two groups getting two separate treatments (b) A matched pairs experiment
See all solutions

Recommended explanations on Math Textbooks

Statistics

Read Explanation

Calculus

Read Explanation

Logic and Functions

Read Explanation

Applied Mathematics

Read Explanation

Decision Maths

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.