The sign of r indicates the _____ of the relationship between two variables. A.

Question

The sign of r indicates the _____ of the relationship between two variables. A. strength B. degree C. magnitude D. direction E. statistical significance All possible members of a defined group describe which? A. A population B. A parameter C. A sample D. An estimated value E. None of the above Which of the following sets of variables would you expect to produce a negative correlation? A. Student absences and grades B. Intelligence and test scores C. Caloric intake and weight D. Height and shoe size E. None of the above The scores on a university examination are Normally distributed with a mean of 62 and a standard deviation of 11. If the bottom 10% of students will fail the course, what is the lowest mark that a student can have and still be awarded a passing grade? A. 62 B. 55 C. 36 D. 44 E. 48 If I want to describe the central tendency of income data, which measure of central tendency would be best? A. Standard deviation B. Mode C. Mean D. Average E. Median

Explanation / Answer

Q5.
Direction

Q6. Population

Q8.
Mean ( u ) =62
Standard Deviation ( sd )=11
Normal Distribution = Z= X- u / sd ~ N(0,1)                  
P ( Z < x ) = 0.1
Value of z to the cumulative probability of 0.1 from normal table is -1.282
P( x-u/s.d < x - 62/11 ) = 0.1
That is, ( x - 62/11 ) = -1.28
--> x = -1.28 * 11 + 62 = 47.9029                  

E.48

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