stats and prob

• the curve is symmetrical about its center

  true
• the _______ coincide at the center

  mean, median, mode
• the ___ of the curve is determined by the ____ of the distribution

  width & standard devition
• the _ of the curve flatten out indefinitely _, always approaching the axis but never _baseline. it is, the curve is asymptotic to the base line.

  tails, along the horizontal axis, never touching it
• the graph of the normal distribution depends on two factors, the _ and the _

  mean & standard deviation
• the total area under the normal curve is equal to ___ or ___ percent

  1 & 100 percent
• a __ has an infinite number of possible values that can be represented by an interval on the number line

  continuous random variable or normal distribution
• how to get the mean

  a + b/2
• how to get the standard deviation (68%)

  a - b/2
• how to get the standard deviation ( 95%)

  a-b/4
• how to get the standard deviation ( 99%)

  a-b/6
• z-scores formula

  z=x-u/o
• x-scores fomula

  x=u+(z)(o)
• the distribution curve is _


  bell shaped
• the _ or simply as _ is a bell-shaped distribution which has important role in inferential statistics

  normal distribution & normal curve
• the width and the height of the normal curve distribution is determined by the _.

  standard deviation
• the small and large numbers of the normal curve distribution is determined by the _.

  variance
• the _ refers to a family of continuous probability distributions described by the normal equation

  normal distribution
• _ % of the data fall within 1 standard deviation of the mean

  68.26
• _ % of the data fall within 2 standard deviation of the mean

  95.44
• _ % of the data fall within 3 standard deviation of the mean

  99.74
• a _ indicates the raw score is higher than the mean average.

  positive z-score
• a _ reveals the raw score is below the mean average

  negative z-score