Answers edited by De Rono

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• What does it mean for a data set to be bimodal?
  
• What is the mean and variance of a random variable with the following probability density function?: #f(x) = 3x^2 if -1 < x < 1#; 0 otherwise
  
• What is the general formula for the variance and mean of a binomial distribution?
  
• How do you derive a cumulative density function from a probability density function?
  
• How do you simplify #5 - 3(y + 7)#?
  
• If six pairs of data yield an r = 0.789 and a regression equation of y= 4x-2, what is the best predicted value of y when x = 5?
  
• How do you graph using slope and intercept of #-7x+y=-19#?
  
• Consider the equation #y = 2 - 3x#. If #y = 11#, what is #x#?
  
• What is a standardized regression coefficient?
  
• What is the standard deviation of #1, 2, 3, 4# and #5#?
  
• What is the variance of {15, 14, 13, 13, 12, 10, 7}?
  
• If you flip a coin three times, what is the probability of getting tails three times?
  
• What does it mean about events #A# and #B# if #P(A|B)=P(B|A)#?
  
• How do you find the intercepts for #y = -x - 2#?
  
• What is the variance of the following numbers?: {3,5,2,2,4,7,8,5,7,12,6,4,}
  
• What is the Kolmogorov formula for conditional probability?
  
• How do you simplify #9y-4-11y+7#?
  
• What is a pooled variance?
  
• How should a scatter plot of data look if there is a negative correlation?