In a within-subjects study that extends over a relatively long time, it is possible that there will be systematic changes in the participants’ skills or knowledge during the time of the study. when these changes influence the participants’ scores, causing scores at the end of the study to be different from scores at the beginning, the effect is called

Maturation

Explanation:

In a within-subjects study that extends over a relatively long time, it is possible that there will be systematic changes in the participants’ skills or knowledge during the time of the study. When these changes influence the participants’ scores, causing scores at the end of the study to be different from scores at the beginning, the effect is called Maturation.

hygrometers and hair thermometers (often found as part of hygrometers/psychrometers) can be used to measure humidity. barometers are used to measure atmospheric pressure, while anemometers are used to measure wind speed. so the 2nd and 4th choices should be the correct answers.