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:
52
Step-by-step explanation:
12 + (38 - 18)2 = 12 + 20 × 2 = 52.
Answer:
sorry
Step-by-step explanation:
Answer:
Step-by-step explanation: I need help
The answer you are looking for is -5x^5-5x^4+6x^3-x^2-7x+20
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