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Vlad [161]
3 years ago
6

In the population of New Town, 30 percent of the people work for Bigg Corporation, 50 percent work in the public section, and 20

percent are self-employed. In a survey of 100 residents of New Town, 30 people worked for Big Corporation, 50 people worked in the public sector, and 20 people were self-employed.
This sample was _________.
Mathematics
1 answer:
Crazy boy [7]3 years ago
8 0

Answer: Stratified Random Sample

Step-by-step explanation:

The sample is a stratified random sample in the sense that each of the population that was sampled consisted of the necessary groups that need to be considered in their right proportion of representation which makes the sample valid for us to reasonably draw a conclusion of what to expect in the larger sample space. This sample favours every possible member of the population and helps us adequately plan for all

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Describe any domain restrictions that make sense for each of these scenarios: The price of a stock fluctuates several times thro
mrs_skeptik [129]

Answer:

  • a) Restriction: days of the year (a discrete time)

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Explanation:

The <em>domain </em>is the set of elements that can be inputs of the <em>function</em>.

<u><em>1. The price of a stock fluctuates several times throughout the year as a function of time.</em></u>

The input variable is the time through out the year.

If you assume that the fluctuaion is recorded once a day, and not every second, the logical assumption is that the time is a day of the year.

Thus, the restricion is the days of the year.

You could represent them in different forms, like DD/MM/YY, or even as a number from 1 to 365 if it covers just one year.

<u><em></em></u>

<u><em>2. A ball is hit into the air by a baseball player, rises until it reaches its highest point, and then falls into left field.</em></u>

The domain is the time the ball is on the air, which may be any real value from t = 0, until the balls touchs the ground.

It is not restricted to integer numbers.

<u><em>3. The volume of a spherical balloon increases as the balloon is blown up and decreases as air is let out of it.</em></u>

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The number of moles can be any real value equal or greater than zero.

Thus, the domain is the positive real values x ≥ 0.

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