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11111nata11111 [884]
2 years ago
7

professor must randomly select 4 students to participate in a mock debate. There are 18 students in his class. In how many diffe

rent ways can these students be selected, if the order of selection does not matter?
Mathematics
1 answer:
Tju [1.3M]2 years ago
5 0
    18 divided by 4 gives 4r2 so we could do 32 different ways

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A fast food restaurant executive wishes to know how many fast food meals teenagers eat each week. They want to construct a 99% c
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Answer:

The minimum sample size required to create the specified confidence interval is 2229.

Step-by-step explanation:

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So it is z with a pvalue of 1-0.005 = 0.995, so z = 2.575

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.

What is the minimum sample size required to create the specified confidence interval

This is n when M = 0.06, \sigma = 1.1

0.06 = 2.575*\frac{1.1}{\sqrt{n}}

0.06\sqrt{n} = 2.575*1.1

\sqrt{n} = \frac{2.575*1.1}{0.06}

(\sqrt{n})^{2} = (\frac{2.575*1.1}{0.06})^{2}

n = 2228.6

Rounding up

The minimum sample size required to create the specified confidence interval is 2229.

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