Answer:
Each student's height was twice as paired t test will be used. The result of the t test paired with a trust interval of 95 percent produced by Excel is the following:
The 95% confidence interval is (8.728, 10.455)
The margin of error: 0.864
Lower bound: 8.728
Upper bound: 10.455
Let d =morning - evening
Hypotheses are:
H_{0}:\mu_{d}=0,H_{a}:\mu_{d}>0
The test statistics is
t = 22.446
The df is: df= 40
The p-value is:
p-value= 0.0000
The evidence suggests that the kids are taller in the morning than in the night.