I ate a bunch of cookies. I had 10 cookies and now I have 6. What was the percent decrease?
1 answer:
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Given:
Sample mean = 65.4
Standard deviation = 1.2
Sample size = 45
Confidence level = 99%
To find:
The confidence interval.
Solution:
The formula for confidence interval is
where, is sample mean, z* is confidence value, s is standard deviation and n is sample size.
Confidence value or z-value at 99% = 2.58
Putting the given in the above formula, we get
Therefore, the correct option is D.
i cant describe but i put y=1/x+3 -4 on the graph hope this helps
