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goldenfox [79]
3 years ago
8

A given poll states “54% of fifth graders read at or above the fifth-grade-level.” If there is a stated margin of error of +/- 2

.5%, what is the 95% confidence interval for this statistic?
Mathematics
1 answer:
marta [7]3 years ago
7 0
The z-score fo a 95% confidence interval is 1.96
Confidence interval of a statistic is given by
C.I.= proportion \pm 1.96(2.5) \\ =54 \pm 4.9 = (54-4.9, 54+4.9) = (49.1, 58.9)
Therefore, we are 95% confident that the proportion of fifth graders who read at or above the fifth grade level is between 49.1 and 58.9.
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For a normal distribution with μ=500 and σ=100, what is the minimum score necessary to be in the top 60% of the distribution?
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Answer:

475.

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z=\frac{x-\mu}{\sigma}

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