Answer:
20
Step-by-step explanation:
All I did was add 15 and 5 which equals 20 which is the correct answer
You get the answer wrong. E.g. 23.4 + 22.3 = 45.7 BUT if you line it up incorrectly 2.34 + 223. = 225.34
Answer: 
Step-by-step explanation:
Given : Sample size : n= 9
Degree of freedom = df =n-1 =8
Sample mean : 
sample standard deviation : 
Significance level ; 
Since population standard deviation is not given , so we use t- test.
Using t-distribution table , we have
Critical value = 
Confidence interval for the population mean :

90% confidence interval for the mean value will be :






Hence, the 90% confidence interval for the mean value= 
Answer:
one solution
Step-by-step explanation: