Essentials of Statistics for The Behavioral Sciences (MindTap Course List)
9th Edition
ISBN: 9781337098120
Author: Frederick J Gravetter, Larry B. Wallnau, Lori-Ann B. Forzano
Publisher: Cengage Learning
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Textbook Question
Chapter 8, Problem 17P
After examining over one million online restaurant reviews and the associated weather conditions, Bakhshi, Kanuparthy, and Gilbert (2014) reported significantly higher ratings during moderate weather compared to very hot or very cold conditions. To verify this result, a researcher collected a sample of n – 25 reviews of local restaurants during an unusually hot period during July and August and obtained an average rating of M = 7.29. The complete set of reviews during the previous year averaged μ – 7.52, with a standard deviation of σ – 0.60.
a. Can the researcher conclude that reviews during hot weather are significantly lower than the general population average? Use a one-tailed test with α – .05.
b. Compute Cohen’s d to measure effect size for this study.
c. Write a sentence demonstrating how the outcome of the hypothesis test and the measure of effect size would appear in a research report.
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Three samples of each of three types of PVC pipe of equal wall thickness are tested to failure under three temperature conditions, yielding the results shown below. Research questions: Is mean burst strength affected by temperature and/or by pipe type? Is there a “best” brand of PVC pipe?
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PVC2
PVC3
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247
299
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277
287
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325
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319
315
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Cool (10º C)
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Click here for the Excel Data File
(a-1) Choose the correct row-effect hypotheses.
a.
H0: A1 ≠ A2 ≠ A3 ≠ 0
⇐⇐ Temperature means differ
H1: All the Aj are equal to zero
⇐⇐ Temperature means are the same
b.
H0: A1 = A2 = A3 = 0
⇐⇐ Temperature means are the same
H1: Not all the Aj are equal to zero
⇐⇐ Temperature means differ
a
b
(a-2) Choose the correct column-effect hypotheses.
a.
H0: B1 ≠ B2 ≠ B3 ≠ 0
⇐⇐…
In a survey of
460
drivers from the South,
397
wear a seat belt. In a survey of
340
drivers from the Northeast,
281
wear a seat belt. At
alpha equals 0.06
,
can you support the claim that the proportion of drivers who wear seat belts is greater in the South than in the Northeast? Assume the random samples are independent. Complete parts (a) through (e).
A random sample of 50 suspension helmets used by motorcycle riders and automobile race-car drivers was subjected to an impact test, and on 18 of these helmets some damage was observed.
Chapter 8 Solutions
Essentials of Statistics for The Behavioral Sciences (MindTap Course List)
Ch. 8.1 - In general terms, what is a hypothesis test? 1. A...Ch. 8.1 - A sample is selected from a population with a mean...Ch. 8.1 - Which of the following accurately describes the...Ch. 8.1 - A sample of n - 25 individuals is selected from a...Ch. 8.2 - What does a type II error mean? a. A researcher...Ch. 8.2 - Which of the following defines a Type I error? a....Ch. 8.2 - Prob. 3LCCh. 8.3 - A research report includes the statement, z -...Ch. 8.3 - Prob. 2LCCh. 8.3 - What assumption is needed before you can use the...
Ch. 8.4 - A population is known to have a mean of = 50. A...Ch. 8.4 - A researcher is conducting an experiment to...Ch. 8.4 - A researcher expects a treatment to produce an...Ch. 8.5 - Under what circumstances can a very small...Ch. 8.5 - A sample of n - 9 scores is selected from a...Ch. 8.5 - If other factors are held constant, then how does...Ch. 8.6 - If the power of a hypothesis test is found to be p...Ch. 8.6 - How does the sample size influence the likelihood...Ch. 8.6 - How is the power of a hypothesis test related to...Ch. 8 - Identify the four steps of a hypothesis test as...Ch. 8 - Define the alpha level and the critical region for...Ch. 8 - Define a Type I error and a Type II error and...Ch. 8 - If the alpha level is changed from = .05 to =...Ch. 8 - Explain how each of the following influences the...Ch. 8 - Ackerman and Goldsmith (2011) report that students...Ch. 8 - Babcock and Marks (2010) review survey data from...Ch. 8 - Childhood participation in sports, cultural...Ch. 8 - The psychology department is gradually changing...Ch. 8 - A random sample is selected from a normal...Ch. 8 - A random sample of n = 16 stores is selected from...Ch. 8 - In a study examining the effect of humor on...Ch. 8 - A random sample is selected from a normal...Ch. 8 - Researchers at a National Weather Center in the...Ch. 8 - A high school teacher has designed a new course...Ch. 8 - Miller (2008) examined the energy drink...Ch. 8 - After examining over one million online restaurant...Ch. 8 - A researcher is evaluating the influence of a...Ch. 8 - A researcher plans to conduct an experiment...Ch. 8 - Research has shown that 10 scores have been...Ch. 8 - Briefly explain how increasing sample size...Ch. 8 - Explain how the power of a hypothesis test is...
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