Posted by **ash** on Wednesday, February 18, 2009 at 2:44pm.

A researcher reports that "Students were randomly assignment to intervention or a control group; the two groups did not differ significantly prior to the start of the intervention. At the end of the study, those receiving the intervention showed statistically significant improvement (p < 0.05) in reading fluency, as compared to those in the control group." Which of the following is NOT a valid inference based on this statement.

A. We can infer that the samples come from two different populations at the end of the study.

B. We can assume that the two groups had identical means and standard deviations at the beginning of the study.

C. The probability that the two groups came from the same population was less than 5%.

D. There is about a 1 in 20 chance that the researcher is incorrectly inferring that the two groups, post-intervention, belong to different populations.

## Answer This Question

## Related Questions

- stats multiple choice ? - A researcher reports that "Students were randomly ...
- stats ? - The Title I coordinator for the district has been tasked with ...
- stats - The Title I coordinator for the district has been tasked with developing...
- statistics - • Linear Regression In the babies.dta full dataset, generate a ...
- public health issue - Scenario In a rural area of Guatemala, three groups of ...
- English - I am psueo conducting an experiment on 144 freshmen high school ...
- statistics - . Using the central limit theorem, construct a 95% confidence ...
- stats ? - A researcher is designing a study to examine whether "talk therapy" (...
- stats - A researcher is designing a study to examine whether "talk therapy" (...
- Statistics - A study in England attempted to determine the "right" method for ...

More Related Questions