sindy35111
28.11.2019 •
Mathematics
An educator wishes to estimate the mean number of hours u that ten year old children in a certain city watch television per day. how large a sample is required if the educator wants to estimate μ within 0.5 hours with 95% confidence? assume σ 1.5
(a) 5.0
(b) 34.6
(c) 35.0
(d) 25.0
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Ответ:
(c) 35.0
Step-by-step explanation:
We are given that ,
Margin of error : E= 0.5 hours
Standard deviation:
Confidence level : 95%
We know that the z-value for 92% confidence level is 1.96.
Now, the formula to find the sample size is given by :-
Substitute all the value in this formula , we get
[Rounded to the next whole number.]
Thus , the minimum sample size = 35.0
Hence the correct answer is option (c) 35.0
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