Andy conducts a study to improve reading scores in elementary schools. he obtains a sample of second-graders whose reading level was very much below average. he enrolls these students in a reading program and then measures their reading level six months later. reading levels were significantly higher after the program than before. because andy selected participants on the basis of their extreme scores, he should be concerned about: a. maturation. b. statistical regression. c. history. d. instrumentation.

B. Statistical regression.

Explanation:

In statistical modeling, regression analysis is a set of statistical processes for estimating the relationships between a dependent variable and one or more independent variables.

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the correct answer is a "it describes nora and mrs. linde's relationship". opcions b and d are not related to the content of the passage in any way. option c could be appropiate but it does not fully capture the effect of the dialogue, while option a is quite appropiate, since the dialogue not only exemplifies the relationship between the characters, but it also captures the effect in the excerpt. we get to know that mrs linde bosses around and already knows nora.