stephenajones503 stephenajones503

12-01-2024
Mathematics

contestada

An educator wishes to estimate the mean number of hours that 10-year-old children in a city watch television per day.
How large a sample is needed if the educator wants to estimate u to within ± 25 hours with 90% confidence? Assume a standard deviation of 1.75 hours.
A. 189
B. 132
C. 231
D. 225
E. 81

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