This document discusses grouped data, means, and confidence intervals. It contains two tables showing the weight and number of patients in different ranges, such as 30-40, 40-50, etc. It also mentions tally marks, frequency, new class intervals, and mid points that are used to analyze grouped data and calculate the mean. The document concludes with a quote by Mark Twain about the pliability of statistics compared to stubborn facts.

1. Biostatistics and Research
Methodology
Asst. Prof. Chaitali C. Dongaonkar,
QA,PGDPL
Department of Pharmaceutics,
PES Modern College of Pharmacy(For Ladies),
Moshi, Pune.
Basics of Grouped Data and Mean

14. Weight No. of Patients
30-40 5
40-50 8
50-60 7
60-70 12
70-80 14
80-90 17

19. Weight No. of Patients
30-40 5
40-50 8
50-60 7
60-70 12
70-80 14
80-90 17

27. C.I. intervals Tally Marks Frequency New Class Intervals Mid Point (m) f.m

39. – Mark Twain
“Facts are stubborn,but statistics are more
pliable.”