Suppose that grades on a midterm and a final have a correlation coefficient of .5 and both exams have an average score of 75 and
1 answer:
Answer:
85
Step-by-step explanation:
The correlation coefficient relates the standarized values of the midterms a final score in this way:
where y is the final score that needs to be found, y^ is the average score on the finals, sy is the standar deviation for the scores on the finals, x is the midterm score, x^ is the average score on the midterms and sx y the standard deviation of the scores on the midterms.
If we issolate y on the equation and solve with the data we have, we get that:
r* \frac{x - x^}{sx}[/tex] = 0.5 * = 1
y = 75 + 1*10 = 85
This means the predicted final score will be 85.
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now, look closely, what "k" value, what exponent, negative or fraction or positive, will ever make "e" to 0? none, so one can say is "undefined".
now, ln is just a shorthand for the logarithm with a base "e" or euler's constant, so-called the "natural logarithm", now, let's use the exponential version of that here, and let's say equals an constant exponent of "k",
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Answer:
Correct option is C
Step-by-step explanation:
First, find the equation of the boundary line. This line passes through the points (0,-3) and (-2,1). Then it has equation
In the attached diagram this boundary line is solid, then the sign of the inequality should be with "or equal to" notion (≤ or ≥). Thus, options A and B are false.
The line divides the coordinate plane into two parts and you have to determine which part to choose. The origin does not lie in the shaded region, then its coordinates cannot satisfy the inequality. Check options C and D.
- origin does not satisfy (option C is correct);
- origin satisfies (option D is false).