STATS

• The curve of a probability distribution is formed by either discrete or __________ random variables.

  continuous
• The symbol __________ denotes a random variable with a standard normal distribution.

  z
• The__________at the horizontal base of the standard normal curve indicates how many standard deviations a score X lies above or below the mean of its distribution.

  z-value/z-score
• The area under the normal curve is equal to __________.

  1
• The area under the normal curve corresponds to the __________ that a random variable having this distribution will take on values on a specified interval.

  probability
• The areas under the standard normal probability distribution are based on the __________.

  z-distribution
• The mean, median, and mode under the normal probability distribution are __________.

  equal
• The tails of the curve of a normal probability distribution extend __________.

  undefinitely
• The middle 95% of the standard normal distribution is bound by the z-values __________.

  z = -2 and z = 2
• The values that describe a standard normal distribution are a mean equal to __________ and a standard deviation equal to __________.


  mean u & standard dev o
• 18th century statistician, first developed normal distribution

  Abraham de Moivre
• used among continuous distribution stats and used in natural & social science

  Normal Distribution
• developed the concept of normal curve from his study


  Karl Gauss
• normal distribution is sometimes referred to as

  normal curve errors / Gaussian Distribution
• used to find the probability that a statistic is observe, below, above, betwee.

  z-table