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Researchers collected a simple random sample of the times that 81 college students required to earn...

Researchers collected a simple random sample of the times that 81 college students required to earn their bachelor's degrees. The sample has a mean of 4.8 years and a standard deviation of 2.2 years. Use a 0.05 significance level to test the claim that the mean for all college students is equal to 4.5 years. Please help! I also keep getting the test statistic as 1.227, am I incorrect?

Math   Statistics-And-Probability   
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Answer #1

We have for given sample,                  
Population mean for given sample=4.5  
Sample mean=4.8          
Sample standard deviation s=2.2      
Sample size =n=81          
                  
Degree of freedom = n-1 =80      
                  
  
                  
t test statistic formula is

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