Understanding Basic Statistics
8th Edition
ISBN: 9781337558075
Author: Charles Henry Brase, Corrinne Pellillo Brase
Publisher: Cengage Learning
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Chapter 1.3, Problem 11P
Critical Thinking An agricultural study is comparing the harvest volume of two types of barley. The site for the experiment is bordered by a river. The field is divided into eight plots of approximately the same size. The experiment calls for the plots to be blocked into four plots per Mock. Then, two plots of each block will be randomly assigned to one of the two barley types.
Two blocking schemes are shown below, with one Mock indicated by the white region and the other by the gray region. Which Mocking scheme. A or B. would be better? Explain.
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Fertilizer: In an agricultural experiment, the effects of two fertilizers on the production of oranges were measured. Twelve randomly selected plots of land were treated with fertilizer A, and
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randomly selected plots were treated with fertilizer B. The number of pounds of harvested fruit was measured from each plot. Following are the results.
Fertilizer A
523
464
483
441
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516
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Fertilizer B
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Part 1 of 3
Explain why it is necessary to check whether the populations are approximately normal before constructing a confidence interval.
Since the sample size is ▼small, it is necessary to check that the populations are approximately normal.
Part 2 of 3
Following are boxplots of these data. Is it reasonable to assume that the populations are approximately normal?
400
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A biologist is studying the plant diversity in 15 million acres of the Sierra Nevada Mountains. He
will count the number of species in 150 acres. Match the strategies to their corresponding
sampling techniques.
The biologist goes to his 150 favorite hiking places and looks at an acres along
each trail.
v The biologist enters the 15 million acres into a data base and had a computer
randomly select 150 of these acres.
The biologist classifies the Sierras into 10 different ecological types and then
makes sure that the proportion of each ecological type from the sample is the same as
the proportion of that of the population.
The biologist orders the 15 million acres by latitude and then surveys every
100000th acre on the list.
| The biologist goes to 15 diverse locations that have 10 acres each and surveys
all 10 acres for each of these 15 locations.
a. Convenience Sampling
b. Cluster Sampling
c. Systematic Sampling
d. Stratified Sampling
e. Simple Random Sampling
A number generator was used to simulate the percentage of
people in a town who ride a bike. The process simulates randomly
selecting 100 people from the town and was repeated 20 times.
The percentage of people who ride a bike is shown in the dot plot.
10 20 30 40 50 60 70 80 90 100
Which statement is true about the population of the town?
O Most likely, 50% to 60% of the town rides a bike.
O Most likely, 60% to 75% of the town rides a bike.
O Most likely, 40% to 50% of the town rides a bike.
O Most likely, 80% to 90% of the town rides a bike.
Chapter 1 Solutions
Understanding Basic Statistics
Ch. 1.1 - Statistical Literacy In a statistical study, what...Ch. 1.1 - Statistical Literacy Are data at the nominal level...Ch. 1.1 - Statistical Literacy What is the difference...Ch. 1.1 - Statistical Literacy For a set population, does a...Ch. 1.1 - Critical Thinking Numbers are often assigned to...Ch. 1.1 - Interpretation Lucy conducted a survey asking some...Ch. 1.1 - Marketing: Fast Food A national survey asked 1261...Ch. 1.1 - Advertising: Auto Mileage What is the average...Ch. 1.1 - Ecology: Wetlands Government agencies carefully...Ch. 1.1 - Archaeology: Ireland The archaeological site of...
Ch. 1.1 - Student Life: Levels of Measurement Categorize...Ch. 1.1 - Business: Levels of Measurement Categorize these...Ch. 1.1 - Fishing: Levels of Measurement Categorize these...Ch. 1.1 - Education: Teacher Evaluation If you were going to...Ch. 1.1 - Critical Thinking You are interested in the...Ch. 1.2 - Statistical Literacy Explain the difference...Ch. 1.2 - Statistical Literacy Explain the difference...Ch. 1.2 - Statistical Literacy Marcie conducted a study of...Ch. 1.2 - Statistical Literacy A random sample of students...Ch. 1.2 - Interpretation In a random sample of 50 students...Ch. 1.2 - Interpretation A campus performance series...Ch. 1.2 - Critical Thinking Greg took a random sample of...Ch. 1.2 - Critical Thinking Consider the students in your...Ch. 1.2 - Critical Thinking Suppose you are assigned the...Ch. 1.2 - Critical Thinking In each of the following...Ch. 1.2 - Sampling: Random Use a random-number table to...Ch. 1.2 - Sampling: Random Use a random-number table to...Ch. 1.2 - Sampling: Random Use a random-number table to...Ch. 1.2 - Prob. 14PCh. 1.2 - Computer Simulation: Roll of a Die A die is a cube...Ch. 1.2 - Prob. 16PCh. 1.2 - Education: Test Construction Professor Gill is...Ch. 1.2 - Education: Test Construction Professor Gill uses...Ch. 1.2 - Sampling Methods: Benefits Package An important...Ch. 1.2 - Sampling Methods: Health Care Modern Managed...Ch. 1.3 - Statistical Literacy A study of college graduates...Ch. 1.3 - Statistical Literacy Consider a completely...Ch. 1.3 - Critical Thinking A brief survey regarding...Ch. 1.3 - Critical Thinking A randomized block design was...Ch. 1.3 - Interpretation Zane is examining two studies...Ch. 1.3 - Interpretation Suppose you are looking at the 2006...Ch. 1.3 - Ecology: Gathering Data Which technique for...Ch. 1.3 - General: Gathering Data Which technique for...Ch. 1.3 - General: Completely Randomized Experiment How...Ch. 1.3 - Survey: Manipulation The NewYork Times did a...Ch. 1.3 - Critical Thinking An agricultural study is...Ch. 1 - Terminology If a numerical measure describes an...Ch. 1 - Terminology If a variable describes an individual...Ch. 1 - Prob. 3CRCh. 1 - Terminology If it makes sense to say that one data...Ch. 1 - Terminology Consider a sample of size n. If every...Ch. 1 - Terminology If a treatment is applied to subjects...Ch. 1 - Critical Thinking Sudoku is a puzzle consisting of...Ch. 1 - Critical Thinking Alisha wants to Jo a statistical...Ch. 1 - Statistical Literacy You are conducting a study of...Ch. 1 - Radio Talk Show: Sample Bias A radio talk show...Ch. 1 - Prob. 11CRCh. 1 - General: Type of Sampling Categorize the type of...Ch. 1 - General: Gathering Data Which technique fur...Ch. 1 - General: Experiment How would you use a completely...Ch. 1 - Student Life: Data Collection Project Make a...Ch. 1 - Form Problem: Fireflies Suppose you air conducting...Ch. 1 - Use a random-number table or random-number...Ch. 1 - Use a random-number table or random-number...Ch. 1 - What does it mean to say that we are going to use...Ch. 1 - In your own words, explain the differences among...Ch. 1 - Simulate the results of tossing a fair die 18...Ch. 1 - Prob. 2UTA
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