Research Methods for the Behavioral Sciences
6th Edition
ISBN: 9781337681698
Author: Frederick J Gravetter; Lori-Ann B. Forzano
Publisher: Cengage Limited
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Chapter 2.4, Problem 8LO
Describe the characteristics of a good hypothesis and identify examples of good and bad hypotheses.
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Stem1: 1,4
Stem 2: 2,4,8
Stem3: 2,4
Stem4: 0,1,6,8
Stem5: 0,1,2,3,9
Stem 6: 2,2
What’s the Min,Q1, Med,Q3,Max?
Are the t-statistics here greater than 1.96? What do you conclude?
colgPA= 1.39+0.412 hsGPA
(.33) (0.094)
Find the P value
A poll before the elections showed that in a given sample 79% of people vote for candidate C. How many people should be interviewed so that the pollsters can be 99% sure that from 75% to 83% of the population will vote for candidate C? Round your answer to the whole number.
Chapter 2 Solutions
Research Methods for the Behavioral Sciences
Ch. 2.1 - Identify possible sources and use them to identify...Ch. 2.1 - Define applied research and basic research and...Ch. 2.2 - Define primary and secondary sources, identity...Ch. 2.2 - Describe the process of conducting a literature...Ch. 2.2 - Describe the differences between a full-text...Ch. 2.3 - Identity the basic sections of an APA-style...Ch. 2.3 - Prob. 7LOCh. 2.4 - Describe the characteristics of a good hypothesis...Ch. 2 - Prob. 1ECh. 2 - Make a list of five ideas for a general research...
Ch. 2 - Based on the following descriptions of studies,...Ch. 2 - Define primary and secondary sources and explain...Ch. 2 - Using PsycINFO (or a similar database), find five...Ch. 2 - Using PsycINFO (or a similar database), find...Ch. 2 - Search in a current newspaper or on a news website...Ch. 2 - How does a full-text database differ from other...Ch. 2 - List the five sections typically found in a...Ch. 2 - Describe the three ways identified in the text to...Ch. 2 - Is the following hypothesis testable, refutable,...Ch. 2 - Determine whether each of the following hypotheses...
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- A clinical study is designed to assess the average length of hospital stay of patients who underwent surgery. A preliminary study of a random sample of 70 surgery patients’ records showed that the standard deviation of the lengths of stay of all surgery patients is 7.5 days. How large should a sample to estimate the desired mean to within 1 day at 95% confidence? Round your answer to the whole number.arrow_forwardA clinical study is designed to assess the average length of hospital stay of patients who underwent surgery. A preliminary study of a random sample of 70 surgery patients’ records showed that the standard deviation of the lengths of stay of all surgery patients is 7.5 days. How large should a sample to estimate the desired mean to within 1 day at 95% confidence? Round your answer to the whole number.arrow_forwardIn the experiment a sample of subjects is drawn of people who have an elbow surgery. Each of the people included in the sample was interviewed about their health status and measurements were taken before and after surgery. Are the measurements before and after the operation independent or dependent samples?arrow_forward
- iid 1. The CLT provides an approximate sampling distribution for the arithmetic average Ỹ of a random sample Y₁, . . ., Yn f(y). The parameters of the approximate sampling distribution depend on the mean and variance of the underlying random variables (i.e., the population mean and variance). The approximation can be written to emphasize this, using the expec- tation and variance of one of the random variables in the sample instead of the parameters μ, 02: YNEY, · (1 (EY,, varyi n For the following population distributions f, write the approximate distribution of the sample mean. (a) Exponential with rate ẞ: f(y) = ß exp{−ßy} 1 (b) Chi-square with degrees of freedom: f(y) = ( 4 ) 2 y = exp { — ½/ } г( (c) Poisson with rate λ: P(Y = y) = exp(-\} > y! y²arrow_forward2. Let Y₁,……., Y be a random sample with common mean μ and common variance σ². Use the CLT to write an expression approximating the CDF P(Ỹ ≤ x) in terms of µ, σ² and n, and the standard normal CDF Fz(·).arrow_forwardmatharrow_forward
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