Kenny Performed an Experiment on the Effects of After-School Educational

question 30

Multiple Choice

Kenny performed an experiment on the effects of after-school educational activities on students' academic performance.His experimental group involved after-school educational activities and his control group involved after-school non-educational activities.The children in the control group felt left out and gave up on the experiment.Which source of internal invalidity is reflected?

• A)instrumentation
• B)testing
• C)statistical regression
• D)demoralization
• E)history

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Definitions:

Sample Median

A measure of central tendency that identifies the middle value in a sorted sample set.

Resamples

The action of drawing repeated samples from the same data set, typically used in bootstrap methods for statistical inference.

Bootstrap Confidence Interval

A bootstrap confidence interval is a type of confidence interval estimate calculated by resampling the original data with replacement, often used to estimate the uncertainty of a statistic.

Average Grade

The mean score calculated from a set of grades or marks awarded for academic performance.