Homework - Frequency Distributions

DIRECTIONS: When computation is required, show all work neatly. For example, if you need to calculate a range, you must show those calculations.

When asked to create frequency distributions in this assignment, list each of the following (in its own column):

• apparent limits (X or Interval)
• exact limits
• midpoints
• frequencies (f)
• proportions (p)
• percents (%)
• cumulative frequencies (Cf)
• cumulative proportions (Cp)
• cumulative percents (C%)

In addition,

• remember the convention of keeping decimal usage consistent within a column.
• make sure to attach Minitab output & label appropriate/important data.

Problems

1. Manually create an ungrouped frequency distribution and then use Minitab to create it. The data represent the average number hours of sleep per night for a bunch of teenagers.
   5, 5, 5, 6, 6, 6, 6, 6, 7, 7, 7, 8, 8, 8, 8, 9, 10, 10, 10, 10, 11, 11.
   
   
2. Manually create a grouped frequency distribution and then use Minitab to create it. The data represent hypothetical scores on an exam.
   63 88 79 92 86 87 83 78 41 67
   68 76 46 81 92 77 84 76 70 66
   77 75 98 81 82 81 87 78 80 60
   94 79 52 82 77 61 77 70 74 61
3. Manually create a grouped frequency distribution and then use Minitab to create it. The data represent the number of hours of TV watching per week for 40 students.
   6  8  7  9 18  8  8  7  4  6
   6 10 14  8  9 25 18  7 17 16
   7 27 19 30  8 20 11  7  8 12
   9 17 15 18 17 35  7  7  7 16
   

Multiple Choice

1. Minitab is MOST like what other mainstream software application?
   a. Wordprocessor
   b. Spreadsheet
   c. Database
   d. Browser
   e. Messaging
   
   
2. If a set of frequencies that are converted to percentages are summed, the total should equal
   a. »1
   b. »100
   c. N
   d. cannot specify beforehand