45 is 90% of what number
2 answers:
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Answer: (145820, 170180)
Step-by-step explanation:
Formula for confidence interval for population mean ( when population standard deviation is unknown ) :
, where n= sample size
= sample mean
s= sample standard deviation
= two-tailed t-value for significance level of (
).
We assume that the salary of CFA charterholders is normally distributed .
Let x represents the salary of CFA charterholders .
As per given , we have
n= 36
Degree of freedom : df = 35 [ df= n-1]
s= $36,000
Significance level :
Using t-distribution table ,
95% confidence interval for the average salary of a CFA charterholders :-
Hence, the 95% confidence interval for the average salary of a CFA charterholder : (145820, 170180)