Biology Forums - Study Force

A researcher studying the prevalence of alcohol use among seniors in a particular high school asked 45 of these youths how many drinks they had consumed in the last week.
 
  Convert the distribution containing four class intervals, and (a) determine the size of the
  class intervals, (b) indicate the upper and lower limits of each class interval, (c) identify the
  midpoint of each class interval, (d) find the percentage for each class interval, (e) find the
  cumulative frequency of each class interval, and (f) find the cumulative percentage for
  each class interval.
  Number of Drinks f
  7 5
  6 9
  5 6
  4 11
  3 4
  2 3
  1 3
  0 4
  N = 45
 
  What would be an ideal response?

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From the following table representing family structure for black and white children in a particular community,
 
  find (a) the percent of black children having two-parent families, (b)
  the percent of white children having two-parent families, (c) the proportion of black children
  having two-parent families, and (d) the proportion of white children having two-parent
  families.
  Family Structure Black White
  One parent 53 59
  Two parents 60 167
  Total 113 226
 
  What would be an ideal response?

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From the following table illustrating the handedness of a random sample of men and women,
 
  find (a) the percent of men who are left-handed, (b) the percent of women who
  are left-handed, (c) the proportion of men who are left-handed and (d) the proportion of
  women who are left-handed. (e) What can you conclude about gender and the prevalence
  of left-handedness?
  Handedness Male Female
  Left-handed 15 8
  Right-handed 86 114
  Total 101 122
 
  What would be an ideal response?

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