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.

hi there!

sorry i was debating over answering this question or not, but i do believe it is a sin to be gay. in the beginning, god created man and he created women to be a for man. there are many "political" views on this topic but i believe the bible is right. in the kjv bible, leviticus 18: 22, god talks about how it it is an abomination for women to be with women and man to be with man. god knows that everybody is a sinner, and he gives everyone a chance to repent. i'm not forcing god's word on anybody, but i do believe it is a sin. no matter the sin, as long as you repent, god is willing to forgive, you just have to accept him as your lord and savior.

definition was not one of the four methods