-Anyone wanna help a sister out??-
2 answers:
Answer:
Option A - The researcher made an error because −1 ≤ r ≤ 1.
Step-by-step explanation:
Given : A researcher is trying to find out if there is a correlation between the U.S. economy and the number of hours spent on social media. The researcher determines that the correlation coefficient is r = 1.26.
To find : What does this value mean?
Solution :
By definition of correlation coefficient,
The correlation coefficient r measures the strength and direction of a linear relationship between two variables on a scatter plot.
The value of r is always between +1 and –1 i.e,
According to researcher,
The correlation coefficient is r = 1.26 >1
So, From the options it means
The researcher made an error because −1 ≤ r ≤ 1.
Therefore, Option A is correct.
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Answer:
13
Step-by-step explanation:
First, fill in 3 boxes of the table using the given information (blue numbers on the attached table)
"Of the 32 students that have a cell phone, 19 students do not have a tablet."
The top row of the table is students who have a cell phone. Therefore, place 19 in the box in this row that is in the "no tablet" column.
"Of the 70 students that have a tablet, 57 students do not have a cell phone."
The first column of the table is students who have a tablet. Therefore, place 57 in the box in the 2nd row of this column.
"11 students do not have a cell phone or a tablet."
Find the "no cell phone" row and the "no tablet" column and place 11 in the box that coincides.
We can calculate the blank totals using addition (shown by green numbers on the attached table)
- Total students with no cell phone = 57 + 11 = 68
- Total students with no tablet = 19 + 11 = 30
To calculate the number of students who have a cell phone AND a tablet:
⇒ Total students with a cell phone <em>minus</em> students with a cell phone but no tablet
⇒ 32 - 19 = 13
