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kompoz [17]
3 years ago
8

You want to create a 99% confidence interval with a margin of error of .5. Assuming the population standard deviation is equal t

o 1.5, what's the minimum size of the random sample you can use for this purpose?
Mathematics
1 answer:
miss Akunina [59]3 years ago
8 0

Answer:

Sample size minimum is 60

Step-by-step explanation:

given that you want to create a 99% confidence interval with a margin of error of .5.

The population  standard deviation is equal to 1.5

i.e. \sigma = 0.5

Confidence level = 99%

Since population std deviation is known, we can use Z critical value for finding margin of error

Z critical value for 99% = 2.58

Margin of error = 2.58*\frac{1.5}{\sqrt{n} }

Equate this to 0.5 and solve for n

2.58*\frac{1.5}{\sqrt{n} }=0.5\\\sqrt{n} =7.74\\n =59.90\\n=60

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3 years ago
What is 25% of 24?<br> What is 15% of 60?<br> 9 is what percent of 72
JulsSmile [24]

Answer:

6

9

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Step-by-step explanation:

this is the easiest way to solve for percentage:

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and the whole number would go in whole

\frac{25}{100} =\frac{?}{24}  Then multiply 24 × 25 ÷ 100 = 6

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7 0
3 years ago
What is the answer to janet makes homemade dolls. Currently, she produces 23 dolls per month. If she increase her production by
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4 0
3 years ago
Which statement is true for the tables?
Flauer [41]

Answer:

Table A represents a function, but Table B does not represent a function.

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We have to select the correct option among the given 4 options after judging the given two tables attached to this question.

The first table shows that for each x values there is only one y value. Therefore, this is a function.

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3 0
3 years ago
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