Researchers wanted to evaluate whether a certain herb improved memory in elderly adults as measured by objective tests. To do? this, they recruited 88 men and 131 women older than 55 years and in good health. Participants were randomly assigned to receive the? herb,30 mg 3 times a? day, or a matching placebo. A measure of memory improvement was determined by a standardized test of learning and memory. After 6 weeks of? treatment, the data indicated that the herb did not increase performance on standard tests of? learning, memory,? attention, and concentration. These data suggest? that, when taken following the? manufacturer's instructions, the herb provides no measurable increase in memory or related cognitive function to adults older than 55years with healthy cognitive function. Complete parts? (a) through? (g) below.

?(f) What is the control group in this? study?

A. The placebo group serves as the control group because this group corresponds to the reference point that will be compared to the other group.

B. The men serve as the control group because this group corresponds to the herb that is being tested.

C. The women serve as the control group because this group corresponds to the herb that is being tested.

D. The herb group serves as the control group because this group corresponds to the reference point that will be compared to the other group.

The placebo group serves as the control group because this group corresponds to the reference point that will be compared to the other group.

Step-by-step explanation:

The control group is a reference point in an experiment they usually never receive any treatment and serves as benchmark to compare other test result which are measured. The control groups also includes individual with similar characteristics like those been tested e.g Age, health history.

Members in a control group are usually given placebos and usually do not know that they are part of the control group. This helps the researcher determine the effectiveness of the study being carried out.

a function could be identified in 3 ways either on a chart,graph, or ordered pairs. first a function is that each point has its own. the rule is that there can be many x's to one y but there can not be 2 x's at different y's. so on a graph when you put a straight line through the y's there should be one dot only to be a function.

step-by-step explanation:

answer: a video game has three difficulty levels: easy, medium, and expert. the game's scoring works in such a way that a player has to score a fixed number of points to advance to the next level, and then the scoring starts over. the total score needed to clear all three difficulty levels is 7,500. two times the number of points needed to clear the easy level is 500 more than the number of points needed to clear the medium level. twice the number of points needed to clear the medium difficulty level is 1,500 more than the number of points needed to clear the expert level. if x, y, and z represent the easy, medium, and expert levels, respectively, and a is the coefficient matrix of the system of equations modeling this situation, identify the inverse matrix, a-1, and the solution matrix, x, of the system of equations.

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