A study of six hundred adults found that the number of hours they spend on social networking sites each week is normally distrib
2 answers:
Answer:
0.48
Step-by-step explanation:
Given : Mean = 17 hours
Standard deviation = 6 hours
n = population size =600
To Find: what is the margin of error for a 95% confidence interval?
Solution:
n= 600
z = 1.96 for a 95 % confidence interval;
Margin of error formula:
Substitute the values
Hence the margin of error for a 95% confidence interval is 0.48
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