Question

A group of 8th and 9th graders were surveyed about whether they use social media to communicate with their friends. The results are shown below in the conditional relative frequency table by row.



A 4-column table with 3 rows. The first column has no label with entries 8th grade, 9th grade, total. The second column is labeled do not use with entries 0.06, 0.19, 0.38. The third column is labeled use with entries 0.84, 0.81, 0.62. The fourth column is labeled total with entries 1.00, 1.00, 1.00.

Which conclusions can be drawn from the results of the survey? Check all that apply.

There is no association between using social media and grade level.
The probability a student uses social media, given that he or she is in 9th grade, is 81%.
A student who is more likely to not use social media is in 8th grade.
An 8th grader is more likely to use social media than not.
Knowing a student’s grade level does not help determine if he or she uses social media.

Answer 1

Answer:

A B D E

Step-by-step explanation:

Answer 2

Options A, B, D, and E are correct answers such that the probability of the usage of social media by 8th and 9th-grade students is given.

A. There is no association between using social media and grade level.

B. The probability a student uses social media, given that he or she is in 9th grade, is 81%.

D. An 8th grader is more likely to use social media than not.

E. Knowing a student’s grade level does not help determine if he or she uses social media.

Probability

Probability is the ratio of the favorable outcomes to the total outcomes.

How to determine the probability?

We can see that, there is no relationship between the usage of social media and grade level so, we can say that there is no association between using social media and grade level.

Probability of using social media by a 9th grader is-

$P_9=\dfrac{0.81}{1}\times 100\\=81\%$

Probability of using social media by a 8th grader is-

$P_8=\dfrac{0.84}{1}\times 100\\=84\%$

We cannot define the usage of social media depending on the grade level.

Thus, Options A, B, D, and E are correct answers.

Learn more about probability here- https://brainly.com/question/11234923

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