Biology Forums - Study Force

Which of the following statements is always true for any two events A and B defined on a sample space S?
 
  A) The complement of event A is event B.
  B) The intersection of A and B is the set of all basic outcomes in either A or B.
  C) If events A and B are mutually exclusive, then A  B = S.
  D) If events A and B are collectively exhaustive, then A  B = S.

Q. 2

The covariance of the following sample data of four (X, Y) pairs: (1, 5 ), (2, 10 ), (4, 7 ), and (5, 9 ) equals:
 
  A) 1.25
  B) 2.50
  C) 3.75
  D) 3.69

Q. 3

Anita collected a data set on the weights (to the nearest pounds) of all students at her university. The best graph to describe this data is a:
 
  A) histogram
  B) pie chart
  C) bar chart
  D) scatter plot

Q. 4

For any distribution, the percent of observations that lie within four standard deviations of the mean is:
 
  A) 93.75 or more.
  B) 93.75 or less.
  C) 6.25 or more.
  D) 6.25 or less.

Q. 5

Which of the following statements about a pie chart is false?
 
  A) A pie chart is graphical representation of the proportion or percentage of frequency of each category of a categorical variable.
  B) A pie chart is usually used to display the relative sizes of categories of a numerical variable.
  C) A pie chart always has the shape of a circle.
  D) The size of each slice of a pie chart is the proportion or percentage of frequency of the corresponding category of a categorical variable.

Q. 6

Suppose you roll a pair of dice. Let A be the event that you roll an even number. Let B be the event that you roll an odd number. Which of the following statements is true?
 
  A) The events A and B are not mutually exclusive.
  B) The intersection of A and B is the empty set .
  C) The events A and B are not collectively exhaustive.
  D) The complement of event B is the set 1, 3, 5, 7, 9, 11.

Content hidden

Above and beyond my expectations for this site