Question: A researcher assigns one classroom to a new educational program and one classroom to be a comparison group. Afterwards, the researcher wonders whether the difference

A researcher assigns one classroom to a new educational program and one classroom to be a comparison group. Afterwards, the researcher wonders whether the difference between the groups on the posttest could be due to the different initial make-up of the two classes. This researcher is wondering about which threat to validity?

Select one:

a. Mortalityb. Statistical powerc. Selectiond. Random heterogeneity of respondents

Step by Step Solution

There are 3 Steps involved in it

1 Expert Approved Answer

Step: 1 Unlock blur-text-image

Question Has Been Solved by an Expert!

Get step-by-step solutions from verified subject matter experts

Step: 2 Unlock

Step: 3 Unlock

Students Have Also Explored These Related Mathematics Questions!

A researcher wants to examine the effectiveness of a new educational program with as little disruption to current class procedures as possible. Therefore, she assigns all of the students in Ms....

1) Why and how did CSU transform the costs of coyote-mediated mercantilism trading from farmers into the benefits of Tiera Fertil-guided specialization services in the farm sector within Costa Rica...

Model Minority Myth: How to avoid it and why 9 Culture and Cultural Diversity and Their Relationship to Academic Achievement Learning Outcomes After reading this chapter, you should be able to ......

Question: What is culture? 9 Culture and Cultural Diversity and Their Relationship to Academic Achievement Learning Outcomes After reading this chapter, you should be able to ... Define culture;...

Create a list you may use in class, with others and solo explain? 9 Culture and Cultural Diversity and Their Relationship to Academic Achievement Learning Outcomes After reading this chapter, you...

Answer the following True/False, Multiple Choice, Fill in blank as QUICKLY AS POSSIBLE*. Please let them be correct answers. No explanation needed. 1 When conducting a one-sample t test, if a sample...

RESEARCH DESIGN We have already discussed potential problems with measurement: reliability, internal validity, and external validity. Internal validity and external validity can also apply to...

1 In a small-scale trial(sample size=9)of a psychotherapy treatment for depression,participants were assessed with a depression scale when they entered the trial and again when they have completed...

please help I don't under stand how to even start this. please help I don't under stand how to even start this. Core Assessment Problem-Solution Business Report with Research Due Date: Unit 8 by...

413-432_CH18_Nachmias.qxd 1/17/07 3:47 PM Page 413 Chapter Index Construction and Scaling Methods INDEX CONSTRUCTION The Purpose of the Index The Sources of the Data The Base of Comparison Methods of...

In your own words, explain how negative signs can affect the direction of a graph of a square root function. You should talk about starting points, direction and end behavior. You have 4 different...

The nuclide U235 has a half-life of 7.10 X 108 years; its daughter Th231 has a half-life of 24.6 hours. Suppose that the Th231 is separated chemically from a sample of U235. Plot, as functions of...

What is the company's profit at the breakeven point? $ 1 , 5 7 5 , 0 0 0 , 0 0 0 $ 2 , 7 5 0 , 0 0 0 $ 2 , 5 0 0 , 0 0 0 $ 0

A company issues 1,050 shares of its common stock for $33,600 cash. Prepare journal entries to record this event under each of the following separate situations.