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2 years ago

This is a drop down menu selection question (fill in the blanks.)

Mathematics

2 answers:

Ymorist [56]2 years ago

5 0

Answer:

1-A-ENLARGEMENT

2-B-2 INCHES PER CENTIMETER

Step-by-step explanation:

Its enlargement because it is bigger than the original. And is 2 inches because for every centimeter there are 2 inches.

Hope this helps, rate thanks and brainliest.

Svetllana [295]2 years ago

3 0

Answer:

Step-by-step explanation: Explanation:

The scale factor is the ratio between the scale drawing measures and the actual measures.

scale drawing length 8 inches

scale factor = ratio = -------------------------------- = --------------- = 2

actual length 4 inches

Also,

scale drawing width 14 inches

scale factor = ratio = ----------------------------- = --------------- = 2

actual width 7 inces

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Nezavi [6.7K]

Answer:

It is 4

Step-by-step explanation:

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3 years ago

The dwarves of the Grey Mountains wish to conduct a survey of their pick-axes in order to construct a 99% confidence interval ab

Dmitry_Shevchenko [17]

Answer:

The minimum sample size needed is 125.

Step-by-step explanation:

In a sample with a number n of people surveyed with a probability of a success of $\pi$ , and a confidence level of $1-\alpha$ , we have the following confidence interval of proportions.

$\pi \pm z\sqrt{\frac{\pi(1-\pi)}{n}}$

In which

z is the zscore that has a pvalue of $1 - \frac{\alpha}{2}$ .

The margin of error is:

$M = z\sqrt{\frac{\pi(1-\pi)}{n}}$

For this problem, we have that:

$\pi = 0.25$

99% confidence level

So $\alpha = 0.01$ , z is the value of Z that has a pvalue of $1 - \frac{0.01}{2} = 0.995$ , so $Z = 2.575$ .

What minimum sample size would be necessary in order ensure a margin of error of 10 percentage points (or less) if they use the prior estimate that 25 percent of the pick-axes are in need of repair?

This minimum sample size is n.

n is found when $M = 0.1$