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1. What is the purpose of conducting an experiment? How does an experimental design accomplish its purpose?2. What are the advantages and disadvantages of an experimental design in an educational study?3. What is more important in an experimental study, designing the study in order to make strong internal validity claims or strong external validity claims? Why?4. In an experiment, what is a control? What is the purpose of a control group? Of single or multiple comparison groups?5. What are confounds? Give an example of a design that has three confounds. Describe three ways to alter the design to address these confounds and explain the advantages and disadvantages of each.6. What does "cause" mean and why is it an important concept in research? How are correlation and causation related?7. You are a researcher interested in addressing the question: does smiling cause mood to rise (i.e., become more positive)? Sketch between-participants, within-participants, and matched-participants designs that address this question and discuss the advantages and disadvantages of each to yielding data that help you answer the question. Describe and discuss each design in 4-5 sentences.
At.05 significance level, is there a difference in mean number of calls per day between 2 employees? Compute the p -value?
Assume that samples of size 2 are randomly selected with replacement from this population of four values. The first samples selected is 11,9. What is the mean of the sampling distribution of means?
A random sample of 500 participants was recruited for the study ? Subjects were allowed to elect to participate in an 3-month exercise program or serve as a control subject (190 chose the program, 310 chose to serve as controls)?
A university found that 20 percent of its students withdraw without completing the introductory statistics. Assume that 20 students registered for the course.
Find the probability that fewer than 5 are satisfied with the airlines. (c)Find the probability that 8 or more are satisfied with the airlines.
1.i wish to find a 95 confidence interval for the mean number of times men change channels with a remote control during
A sample of 40 new baseball with mean of 92.67 and standard deviation of 1.79 does it have a mean hieght that is less than a ball with a mean of 92.84
Sometimes data is easy to collect, at other times it may not be as easy. Sometimes in the real world the number of things/people we want to collect data from or about are so huge and we have to make decisions on how this can be done in as reliable a ..
If you must estimate the population mean within 10 days, how many outside salespeople should you sample? Use the 90 percent confidence level.
Two semiconductor factories are being compared to see if there is a difference in the average defect rates of the chips they produce. In the first factory, 250 chips are sampled. In the second factory, 350 chips are sampled. The proportions of def..
What are the benefits and drawbacks of traditional and authentic assessments in math and science?
Assume that the standard deviation of college student IQ's is 10. A random sample of 100 students from a college showed an average IQ of 110. Compute a 95% confidence interval for the mean IQ of students attending this college.
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