BA Chapter 5b (pages 143-165)

Question 1

Each individual is chosen ______ and entirely by chance, such that each individual has the same ________ of being chosen at any stage during the sampling process.

Answer 1

randomly; probability

Question 2

A table or an equation that links each outcome of a statistical experiment with its ________ of occurrence. A probability distribution can be either d_______ or c_______, depending on the nature of the random variable it models.

Answer 2

probability; discrete; continuous

Question 3

• The basis for generating _________ from probability distributions is the concept of a random number. A random number is one that is uniformly distrubuted between ________.
• Formula for generating random numbers in Excel:
  • = _________
  • Pressing ____ or ____ will update or change the value of this function
  • To manually update only, go to Formulas > Calculation Options > Manual

Answer 3

• random samples; 0 and 1
• Formula:
  
  • =RAND( )
  • F9; <enter></enter>

Question 4

Characterizes a _______ random variable for which all outcomes between some minimum and maximum value are ______ likely.

Answer 4

continuous; equally

Question 5

• The Poission distribution is a _______ distribution used to model the number of _______ in some unit of measure–for example, the number of customers arriving at the Subway store during a weekday lunch hour.
• The Poisson distribution assumes:
  
  • No limit on the number of occurences (meaning that the ramdom variable X may assume any nonnegative integer value).
  • Occurences are independent.
  • The average number of occurrences per unit is a constant lambda λ.

Answer 5

• discrete; occurrences