Ugly fries Few people want to eat discolored french fries. Potatoes are kept refrigerated before being cut for french fries to prevent spoiling and preserve flavor. But immediate processing of cold potatoes causes discoloring due to complex chemical reactions. The potatoes must therefore be brought to room temperature before processing. Researchers want to design an experiment in which tasters will rate the color and flavor of french fries prepared from several groups of potatoes. The potatoes will be freshly picked or stored for a month at room temperature or stored for a month refrigerated. They will then be sliced and cooked either immediately or after an hour at room temperature. Identify the experimental units, explanatory variable(s), the treatments, and the response variable(s).

Short Answer

Expert verified

Flavor and color rating are the response variables.

Step by step solution

01

Given information

Researchers intend to conduct an experiment in which tasters score the colour and flavour of French fries made from various potato varieties. The potatoes will be plucked fresh and stored at room temperature for a month or refrigerated for a month. After that, they'll be cut and fried right away or after an hour at room temperature.

02

Concept

A response variable is a variable that is used to measure the outcome.

03

Explanation

Disturbing fries Few people need to consume soiled fries. To prevent spoilage and preserve flavour, potatoes are kept chilled before being sliced for fries. However, due to complex chemical responses, fast handling of cold potatoes causes discoloration. Before handling the potatoes, bring them to room temperature in this manner. Scientists must design an experiment in which participants score the color and flavor of fries made from various potato varieties. The experimental units are included in the original population for whom the researcher is gathering data. The potatoes are the experimental units in this case. Storage time and slicing time till cooking are explanatory variables. Subjects are subjected to treatments in order to obtain their feedback.

a. Fresh and cooked immediately.

b. Fresh and cooked after one hour.

c. Stored and cooked later.

d. Kept in the refrigerator and cooked immediately.

e. Kept at room temperature and cooked later.

f. Kept in the refrigerator and cooked for an hour.

A response variable is one that is used to determine the outcome. The response variables are flavour and colour rating.

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 Vaia!

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

In an interesting experiment, researchers examined the effect of ultrasound on birth weight. Pregnant women participating in the study were randomly assigned to one of two groups. The first group of women received an ultrasound; the second group did not. When the subjects’ babies were born, their birth weights were recorded. The women who received the ultrasounds had heavier babies.

Did the experimental design take the placebo effect into account? Why is this important?

Sampling stuffed envelopes A large retailer prepares its customers’ monthly credit card bills using an automatic machine that folds the bills, stuffs them

into envelopes, and seals the envelopes for mailing. Are the envelopes completely sealed? Inspectors choose 40 envelopes from 1000 stuffed each hour for visual inspection. Identify the population and the sample.

Exercise and heart rate A student project measured the increase in the heart rates of fellow students when they stepped up and down for three minutes to the beat of a metronome. The step was either 5.75or 11.5inches high and the metronome beat was 14,21or 28steps per minute. Five students stepped at each combination of height and speed.

Technology for teaching statistics The Brigham Young University (BYU) statistics department is performing experiments to compare teaching methods. Response variables include students’ final-exam scores and a measure of their attitude toward statistics. One study compares two levels of technology for large

lectures: standard (overhead projectors and chalk) and multimedia. There are eight lecture sections of a basic statistics course at BYU, each with about 200students. There are four instructors, each of whom teaches two sections. Suppose the sections and lecturers are as follows:

(a) Suppose we randomly assign two lecturers to use standard technology in their sections and the other two lecturers to use multimedia technology. Explain how this could lead to confounding.

(b) Describe a better design for this experiment.

sampling all listed residential telephone numbers in the United States. Of 45,956 calls to these numbers, 5029 were completed. The goal of the survey was to estimate how far people drive, on average, per day.14

(a) What was the rate of nonresponse for this sample?

(b) Explain how nonresponse can lead to bias in this survey. Be sure to give the direction of the bias.

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.

Sign-up for free