Question

I asked a random sample of 15 adults, aged 25 - 50, how many hours per week they spent playing video games. The responses were as follows:

7, 15, 3, 1, 2, 2, 0, 0, 10, 5, 1, 1, 2, 0, 2

With a mean of 3.4 and a standard deviation of 4.256, determine a 90% confidence interval.

Answer 1

We have given that,          
          
Sample mean =3.4  
Sample standard deviation =4.256
Sample size =15  
Level of significance=1-0.90=0.1  
Degree of freedom =14  
          
t critical value is (by using t table)=   1.7613  
          
Confidence interval formula is

=(1.46,5.34)