Given the following information, calculate sp2, the pooled sample variance that should be used in the pooled-variance t test. 
Definitions:
Performance Appraisal
A periodic review and evaluation of an employee's performance, usually conducted to determine wage increases, promotions, and development needs.
Effective Branding
The process of creating a distinctive and durable perception in the minds of consumers, differentiating a product or service from its competitors.
Tangible Aspects
The physical or material characteristics of something, easily perceived by the senses.
Employer Branding
The process of promoting a company as the employer of choice to a desired target group, one which a company needs and wants to recruit and retain.
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