Suppose the mean height in inches of all 9th grade students at one high school is estimated the population standard deviation is
4 inches the height of 7 randomly selected students are 69,74,66,66,62,64,and 74 what is the margin of error at 99% confidence level
1 answer:
Answer:
1.474
Step-by-step explanation:
Given that :
Population standard deviation, σ = 4
Sample size = 7
Confidence level = 99%
Since we ore using the population standard deviation, the we use the Z distribution table:
The margin of error :
Zcritical * σ/√n
Zcritical at 99% = 2.58
The margin of error :
2.58 * 4/√7
2.58 * 0.5714285
= 1.474
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