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makvit [3.9K]
3 years ago
10

Can you please help me with this, I have no idea

Mathematics
1 answer:
sergejj [24]3 years ago
6 0
I have no clue sorry
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The weekly earnings of students in one age group are normally distributed with a standard deviation of 47 dollars. A researcher
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Answer:

Option D) 340

Step-by-step explanation:

We are given the following in the question:

Alpha, α = 0.05

Population standard deviation, σ = $47

Margin of error = 5

95% Confidence Interval:

\mu \pm z_{critical}\frac{\sigma}{\sqrt{n}}

\text{Margin of error} = z_{critical}\frac{\sigma}{\sqrt{n}}

Putting the values, we get,

z_{critical}\text{ at}~\alpha_{0.05} = 1.96

5 = 1.96(\dfrac{47}{\sqrt{n}} )\\\\\sqrt{n} = \dfrac{47\times 1.96}{5}\\\\n = 339.443776\\\Rightarrow n \approx 340

Thus, the correct answer is

Option D) 340

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3 years ago
Philip is conducting a survey to determine the weight of 100 cows on a farm. Which of the following questions is an appropriate
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Because Philip is conducting a survey that pertains to the weight of the cows, he needs statistics that directly relate to weight.

The cows being overweight doesn't give Philip concrete information on the weight of the cows, as it doesn't give the amount of pounds a cow weighs. Average age has nothing to do with weight, and normal body weight doesn't give concrete information on weight.

The answer is "<span>What is the weight of each cow on the farm?".</span>
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1.2 which is 6/5 in fraction form

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Answer:

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Step-by-step explanation:

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