Statistics Chapter 2.1 Flashcards

Service Times Summary

• Summary includes 47 individuals.
• Original service times remain indeterminate due to class limits.

Frequency Table of Grades

• Grades: A (2), B (11), C (17), D (6), F (2).
• Relative frequencies calculated as follows:
  • A: 5.26%, B: 28.95%, C: 44.74%, D: 15.79%, F: 5.26%.

Frequency Distribution of Awards by Age

• Lower class limits: 25, 35, 45, 55, 65, 75, 85.
• Upper class limits: 34, 44, 54, 64, 74, 84, 94.
• Class width is 10.
• Midpoints are: 29.5, 39.5, 49.5, 59.5, 69.5, 79.5, 89.5.
• Class boundaries include 24.5 as the lowest boundary.
• Total individuals: 90.

Blood Platelet Count Distribution

• Class limits: 0-99, 100-199, 200-299, 300-399, 400-499, 500-599, 600-699.
• Total individuals computed as 153.
• Class widths are set at 100.
• Midpoints range from 49.5 to 649.5.
• Class boundaries start from -0.5 to 699.5.

Normal Distribution Check

• The distribution does not appear to be normal based on strict interpretation of criteria.

BMI Frequency Distribution

• Constructed from BMI values for 20 females with class limits starting at 15.0 and width of 6.0.
• Frequency counts for BMI ranges:
  • 15.0-20.9: 3,
  • 21.0-26.9: 8,
  • 27.0-32.9: 5,
  • 33.0-38.9: 2,
  • 39.0-44.9: 2.

Screw Length Frequency Distribution

• Class limits start at 3.220 inches with a 0.010 inch width.
• Classes include ranges like 3.220-3.229 and 3.230-3.239.

Daily Rainfall Distribution

• Constructed with a lower limit of 0.00 and a width of 0.20.
• Recorded data frequencies: 21, 6, 2, 0, 0, 0, 1.
• Distribution is not symmetric and does not exhibit normal characteristics.

Weight Data Analysis

• Last digits of weights from 10 students produced a frequency distribution.
• Discrepancies in distribution suggest weights may be reported, particularly more 0s and 5s indicate less accurate measurements.

Data Variation Characteristic

• Variation is the term used to measure the degree of variability among data values.

Understanding Data Distribution

• A frequency distribution aids in comprehending data set distribution nature.

Relative Frequency Concept

• In a relative frequency distribution, class frequencies are expressed as proportions or percentages.