Suppose we have collected times, in minutes, that it takes volunteers to complete a set of pencil and paper mazes. volunteers are randomly assigned to one of two groups. group 1 watch a 5 minute video explaining good strategies for completing the mazes. group 2 watch a 5 minute video of other people successfully completing the mazes, but with no explanation given. researchers are interested in testing against the null hypothesis that there is no difference in population mean times that it takes people to complete mazes after watching either type of video. there are the summary statistics after collecting data. note that the sample sizes differ, because some subjects did not follow instructions correctly and so they were not included in the analysis. x1 = 11.98, x2 = 9.15s1 = 8.69, s2 = 7.75n1 = 43, n2 = 52a. is this an experimental or observational study?

Is an experimental study

Step-by-step explanation:

In an observational study you don't control any aspect of the investigation you just observe the variables that you determined since the beginning without any intervention.

In this case you are controlling who sees one or the other video, then you are controlling one of the variables that is the type of video each group sees and because of this it is an experimental study. Researchers designed an experiment to prove the null hypothesis they had.

from the figure we get,

the x axis shows   the months and,

the y-axis shows the number of satisfied customer.

each line or each cell in upward direction (y-axis) shows 500.

the appropriate scale for the y - axis is: -

a = 2000 customers

b = 4000 customers

c = 6000 customers

d = 8000 customers

e = 10000 customers

f = 12000 customers

g = 14000 customers

its a straight line parallel to the time axis