Question

QUESTION 1

1. Suppose a data set is skewed left. What is the most likely relationship between the mean and the median?

   	a.	The mean is smaller than the median.
   	b.	The mean is larger than the median.
   	c.	The mean and median are not related to each other at all.
   	d.	The mean and median are essentially equal.

QUESTION 2

1. Which of the following CANNOT be obtained by a boxplot?

   	a.	mean
   	b.	IQR
   	c.	all of the above can be obtained by a boxplot
   	d.	median
   	e.	range

QUESTION 3

1. Which of the following describes a strong statistical correlation?

   	a.	All of these are correct interpretations.
   	b.	One measurement variable has a cause and effect relationship with another measurement variable/
   	c.	Two measurement variables have a strong linear relationship.
   	d.	The value of one measurement variable is always equal to the square of the value of another measurement variable.

  

QUESTION 4

1. Suppose your score on the GRE (Graduate Records Exam) was at the 95th percentile. What does that mean?

   	a.	95% of the other students scored lower than you did.
   	b.	5% of the other students scored lower than you did.
   	c.	Only 95% of students who took the exam passed.
   	d.	You got 95% of the exam questions correct.

QUESTION 5

1. There is a strong correlation between verbal SAT scores and College GPA. However, this does not mean that higher SAT scores cause higher grades in college. What could explain this relationship?

   	a.	Both SAT scores and GPAs change over time.
   	b.	The relationship is coincidental.
   	c.	Gender is a confounding variable.
   	d.	The high (low) SAT scores and high (low) GPAs both result from a common cause.

QUESTION 6

1. Which of the following describes the entire area underneath a frequency curve?

   	a.	The area is equal to the total number of individuals in the population.
   	b.	The area is 1 or 100%
   	c.	The area is 0, .5, or 1 or 0% 50% or 100%.
   	d.	The area is equal to the total percentage of individuals in the population with the measurement being studied.

Answer 1

(1) Option(a): The mean is smaller than the median.

>> For left-skewed data: Mean < Median < Mode.

(2) Option(a): Mean.

>> Mean cannot be obtained from a boxplot. A boxplot shows us median, quartiles, iqr, maximum, minimum, range and outliers.

(3) Option(c): Two measurement variables have a strong linear relationship.

(4) Option(a): 95% of the other students scored lower than you did.

(5) Option(d): The high (low) SAT scores and high (low) GPAs both result from a common cause.

(6) Option(b): The area is 1 or 100%.