The following table shows analyst sentiment ratings for the 30 stocks listed in the Dow Jones Industrial Average. 
(See the Excel Data File.)
A) Construct a frequency distribution, relative frequency distribution, cumulative frequency distribution and relative cumulative frequency distribution using classes of 2 up to 4, 4 up to 6, 6 up to 8, and 8 up to 10.
B) Construct a histogram that summarizes the data.
C) What percentage of the stocks in the Dow Jones Industrial Average received a sentiment rating less than 8?
D) What percentage of the stocks in the Dow Jones Industrial Average received a sentiment rating of 6 or more?
Definitions:
Fixed-ratio
A schedule of reinforcement where a response is rewarded only after a specified number of responses, often used in behavior therapy and training.
Variable-interval
A variable-interval schedule in psychology refers to a reinforcement strategy where a response is rewarded after an unpredictable amount of time has passed.
Secondary Reinforcer
A learned stimulus that acquires its reinforcing qualities through association with primary reinforcers.
Primary Reinforcer
A stimulus that is naturally satisfying or rewarding, like food or water, which does not require learning to be effective.
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