Standard Deviation Of The Distribution Of The Difference Between Means is known as standard error
 
t-score = (mean1-mean2)/ standard error

Here
mean 1 = 55
mean 2 = 51
Standard error=0.76  (square root of (6.5/15 + 4.5/23))
 
T-score = (55-51)/0.76
=4/0.76
 
T-score =5.263 >>> answer
 

The High Performance Organization have following five characteristics because of which they excel in the market. They have: 

• Achievable goals.
• Sar values both inside and outside the organization.
• Strategic focus aligned with the organization or company's strategy.
• Ability to adapt to changes.
• Common and shared business model.

For more information check out the following site
 
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Interpersonal communication means written as well as verbal communication among people. The 2 main categories of interpersonal communication are:

Verbal communication includes words, tone, volume, speed etc.

Non-verbal communication includes gestures, expression or written languages etc.

Effective interpersonal Communication can be achieved by:

• Treating each other with respect
• not volunteering others
• speaking only … Read more