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Agata [3.3K]
3 years ago
13

A principal wants to know if students at a particular high school are in favor of a new dress code at their school. The principa

l is not able to ask the opinion of every student at the school, so she needs to select an appropriate sample of the students to represent the high school. Select which sample of students the principal should choose. A Students randomly selected from a list of all students at the school. B Students sitting at randomly selected tables in the library. Students she selects from the hallway between classes. Students selected by the teachers.​
Mathematics
2 answers:
svp [43]3 years ago
8 0

Answer:

student randomly selected from a list of all students at the school

STatiana [176]3 years ago
5 0
Chupapi munyanyo uhhh zaddy
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The slope of this line will be y=-3/4x+3

Step-by-step explanation:

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3 years ago
You want to obtain a sample to estimate how much parents spend on their kids birthday parties. Based on previous study, you beli
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Answer:

We need to sample at least 1069 parents.

Step-by-step explanation:

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Now, we have to find z in the Ztable as such z has a pvalue of 1-\alpha.

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Now, find the margin of error M as such

M = z*\frac{\sigma}{\sqrt{n}}

In which \sigma is the standard deviation of the population and n is the size of the sample.

How many parents do you have to sample?

We need to sample at least n parents.

n is found when M = 4, \sigma = 79.5. So

M = z*\frac{\sigma}{\sqrt{n}}

4 = 1.645*\frac{79.5}{\sqrt{n}}

4\sqrt{n} = 1.645*79.5

\sqrt{n} = \frac{1.645*79.5}{4}

(\sqrt{n})^{2} = (\frac{1.645*79.5}{4})^{2}

n = 1068.92

Rounding up

We need to sample at least 1069 parents.

6 0
3 years ago
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mojhsa [17]

Answer:

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3 years ago
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