To determine whether a cause-effect relationship exists between two variables, a researcher must use an experimental approach.
<h3>What is
cause-effect relationship?</h3>
A cause-and-effect relationship is one which satisfies some conditions like:
- two events occur at the same time and in the same place
- one event immediately precedes the other
Therefore, To determine whether a cause-effect relationship exists between two variables, a researcher must use an experimental approach.
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<span>The question aks us to determine which statement is always true about the angles in the figure. If angle A and B form a right angle, then C must be also a right angle, which is not correct. Also if A and C form a right angle, then angle B must be a right angle. So answers A and C are false. Also thet we know that the sum of the interior angles of the triangle is 180 degrees. A + B + C = 180 deg. ( or a straight angle ). Answer: B. Angle A, angle B, and angle C, form a straight angle. </span>
Answer:
D. All of the above
Step-by-step explanation:
Samples may be classified as:
Random: Basically, put all the options into a hat and drawn some of them.
Systematic: Every kth element is taken. For example, you want to survey something on the street, you interview every 5th person, for example.
Cluster: Divides population into groups, called clusters, and each element in the cluster is surveyed.
Stratified: Also divides the population into groups. However, then only some elements of the group are surveyed.
In this problem:
Two random samples are selected and combined. The combination is a random sample. So A. is correct.
They are not balanced. More male professors than female are chosen. So B. is correct.
The teachers are divided into groups(male and female). And some members of each group are selected. So C. is correct.
So the correct answer is:
D. All of the above
The time 0.825 is 49.5 minutes based on the conclusion that the sum of the different amounts of time was 7.825 hours.
<h3>What is the proportion in time?</h3>
Proportion in time refers to the relationship between two or more ratios or quantities expressed in time measurements.
<h3>Data and Calculations:</h3>
One hour = 60 minutes
One minute = 60 seconds
0.825 of an hour = 49.5 minutes (0.825 x 60 minutes)
0.5 minutes = 30 seconds (0.5 x 60)
Thus, we can conclude that the total time involved is <u>7 hours, 49 minutes, and 30 seconds</u>.
Learn more about time proportions at brainly.com/question/27817533
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Simple random should be the answer idk I’m just tryin get some points lol
