A financial analyst wanted to estimate the mean annual return on mutual funds. A random sample of 60 funds' returns shows an average rate of 12%. If the population standard deviation is assumed to be 4%, the 95% confidence interval estimate for the annual return on all mutual funds is
A. 0.037773 to 0.202227
B. 3.7773% to 20.2227%
C. 59.98786% to 61.01214%
D. 51.7773% to 68.2227%
E. 10.988% to 13.012%
Answer: E. 10.988% to 13.012%
Step-by-step explanation:
Given;
Mean x= 12%
Standard deviation r = 4%
Number of samples tested n = 60
Confidence interval is 95%
Z' = t(0.025)= 1.96
Confidence interval = x +/- Z'(r/√n)
= 12% +/- 1.96(4%/√60)
= 12% +/- 0.01214%
Confidence interval= (10.988% to 13.012%)
Honestly, I don’t really know but I believe it’s 3
3.0*10^2= .03 this is a possible answer
Considering the situation described, the measure of angle x is of 60º.
<h3>What is the measure of angle x?</h3>
Researching this problem on the internet, we have that a 180º ray is bisected into two parts, each of 90º.
- The first part has angles of 70º and y.
- The second part has angles of 60º and x.
Due to the bisection, angles 60º and x are complementary, that is, they add up to 90º, hence:
60º + x = 90º
x = 30º.
The measure of angle x is of 60º.
More can be learned about measures of angles at brainly.com/question/25716982
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