Research Methods for the Behavioral Sciences (MindTap Course List)
6th Edition
ISBN: 9781337613316
Author: Frederick J Gravetter, Lori-Ann B. Forzano
Publisher: Cengage Learning
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Textbook Question
Chapter 8, Problem 12E
Identify the advantages of a multiple-group design compared to an experiment with only two groups.
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A researcher conducts an experiment comparing two treatment conditions and wants to have 30 scores in each treatment condition. Which design would require
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A school psychologist wants to test the effectiveness of a new method of teaching biologybiology. She recruits 500500 firstfirst-grade students and randomly divides them into two groups. Group 1 is taught by means of the new method, while group 2 is taught by traditional methods. The same teacher is assigned to teach both groups. At the end of the year, an achievement test (graded on a scale from 1-10) is administered and the results of the two groups are compared. Complete parts (a) through (i) below.(a) What is the response variable in this experiment?
A.The scores on the achievement tests of both group 1 and group 2
B.The students' ability in biologybiology
C.The score of group 1 on the achievement test
D.The score of group 2 on the achievement test
(b) Is the response variable qualitative or quantitative?
A.The response variable is quantitative because it is a measurement.
B.The response variable is quantitative because it is a characteristic.
C.The response variable is…
A study wants to compare the effectiveness of a tablet app to flash cards with regard to a toddler’s letter recognition at the end of a two month trial period. A group of 100 toddlers were randomly divided into two groups. One group was given the tablet and app, while the other group used the flash cards for the two months. At the end of the two months the researcher stated that the app group had a higher proportion of letters recognized than the flash card group. The two samples found in this study are which of the following?
Group of answer choices
Two dependent (matched pairs/paired data)
Two independent
Case-control
None of these
Chapter 8 Solutions
Research Methods for the Behavioral Sciences (MindTap Course List)
Ch. 8.1 - Describe, compare, and contrast the defining...Ch. 8.1 - Explain the general advantages and disadvantages...Ch. 8.2 - Define individual differences and explain how...Ch. 8.3 - Identify the three primary techniques for limiting...Ch. 8.4 - Describe how individual differences influence...Ch. 8.4 - Identify the options for reducing or controlling...Ch. 8.5 - Describe how differential attrition and...Ch. 8.6 - Describe how between-subjects designs are used to...Ch. 8 - In addition to the key words, you should also be...Ch. 8 - At the beginning of this chapter (p. 186) we...
Ch. 8 - In a between-subjects design, each individual...Ch. 8 - A researcher has a sample of 30 rats that are all...Ch. 8 - Briefly explain how a participant characteristic,...Ch. 8 - Explain the advantages and disadvantages of using...Ch. 8 - A recent survey at a major corporation found that...Ch. 8 - Describe how individual differences can produce...Ch. 8 - Explain how holding a participant variable such as...Ch. 8 - Describe some of the problems that can arise when...Ch. 8 - Describe the advantages of a two-group design...Ch. 8 - Identify the advantages of a multiple-group design...
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- What are the advantages of conducting experiments with more than two groups or conditions?arrow_forwardBajelt Rnows 3. A pharmaceutical company that wants to test the effectiveness of a new allergy drug identifies 250 females 30-35 years old who suffer from severe allergies. The subjects are randomly assigned into two groups. One group is given the new allergy drug and the other is given a placebo that looks exactly like the new allergy drug. After 6 months the subjects' symptoms are studied and compared. Q: Identify a problem with this experiment and suggest a way to improve it. samplon coutbusearrow_forwardA psychologist conducts a 2 x 3 x 2 ANOVA. How many main effects are possible? How many interactions are possible?arrow_forward
- Camille for her part wants to assess the impact of an awareness campaign aimed at reducing the amount of household food waste. The campaign is taking place in a subset of neighborhoods of Ville de Montréal. Camille’s objective is to compare the average amount of food waste produced in those neighborhoods, with that in neighborhoods not targeted by the campaign. Therefore, she randomly chooses five neighborhoods targeted by the campaign and five neighborhoods where the campaign does not take place. In each of the 10 neighborhoods, she monitors the weekly amount of food waste (kg) for each of a number of households, and calculates amounts on a per household basis; see below. Is the amount of food waste per household in the neighborhoods targeted by the campaign lower, on average, than in those not targeted by the campaign? Use α= 0.05.arrow_forwardA researcher is running a study to determine the proportion of men that wear neckties to work. To collect data, he keeps track of how a group of men are dressed as the enter an office building. Is this an observational study or an experiment? Why? Identify the sample and population of this study. In order to match the demographics of the company, the researcher wants 10% of the sample to be management and 90% to not be. How can this be done using stratified sampling? The researcher also decides to keep track of subjects' age. This would be considered: stratifying, bias, blocking, control? If the researcher removed all employees of Asian descent from the sample, what is this considered?arrow_forwardThe number of destination weddings has skyrocketed in recent years. For example, many couples are opting to have their weddings in the Carribean. A recent advertisement recently stated that the cost of a Carribean wedding was less that $30,000. Here is a sample of 8 weddings ($28,500) ($29,500) ($29,900) ($30,200) ($29,200) ($30,400) ($29,000) ($28,900). At the 0.05 significance level, is it reasonable to conclude the mean wedding cost is less than $30,000 as advertised? State the null and alternative hypothesis. Use a 0.05 level of significance (round to 3 decimal places). State the decision rule for 0.05 significance level (round to 3 decimal places). Compute the value of the test statistic (round to 3 decimal places).arrow_forward
- An experimenter is interested in the effects of two independent variables onself-esteem. What is better about conducting a factorial experiment thanconducting two separate experiments, one for each independent variable?arrow_forwardIf conducting an experiment, how important is having a representative sample of subjects? Will college students suffice?arrow_forwardA large study used records from Canada’s national health care system to compare the effectiveness of two ways to treat prostate disease. The two treatments are traditional surgery and a new method that does not require surgery. The records described many patients whose doctors had chosen one or the other method. The study found that patients treated by the new method were more likely to die within eight years. Explain why this is an observational study and not an experiment.arrow_forward
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