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Artist 52 [7]
3 years ago
11

A sample of 100 janitors in a certain school district found that the average time each janitor had worked for the school distric

t was 8 years. Suppose we know that the standard deviation of the population is s=5 years. Construct a 95% confidence interval for the mean time of the population of janitors have spent with the school district.
A) 8±1.98
B) 8±0.82
C) 8±0.71
D) 8±1.53
E) 8±0.98
Mathematics
1 answer:
Crank3 years ago
8 0
First, we get the standard error of the mean using
σm = σ / √N
= 5 / √100
= 0.5

Next, we subtract and add 1.96 standard deviations from the mean (since the confidence interval is 95%). So,
8 ±1.96 (0.5)
= 8 <span>± 0.98

The answer is
</span>E) 8±0.98
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2 years ago
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ElenaW [278]

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Step-by-step explanation:

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Make the denominator the same by multiplying the first fraction by 2 to make both denominators 6.

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Now we can calculate the numerators and keep the denominators the same.

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7 0
2 years ago
A trailer will be used to transport several 40-pound crates to a store. The greatest amount of weight that can be loaded into th
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Given :

A trailer will be used to transport several 40-pound crates to a store.

The greatest amount of weight that can be loaded into the trailer is 1,050 pounds.

An 82-pound crate has already been loaded onto the trailer.

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The greatest number of 40-pound crates that can be loaded onto the trailer.

Solution :

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7 0
2 years ago
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