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nadya68 [22]
3 years ago
7

Mrs. Branch wants to conduct a survey to determine which booth her 7th grade students want to run at the school carnival. Determ

ine which surveys would, or would not, create a random sample for this population.
Mathematics
1 answer:
lora16 [44]3 years ago
6 0

Answer: stratified sampling and judgement sampling

Step-by-step explanation:

Stratified sampling is a probability method that is superior to random sampling because it reduces sampling error. A stratum is a subset of the population that share at least one common characteristic.

While

Judgment sampling is a nonprobability method. The researcher chooses the sample based on judgment. This is usually and extension of convenience sampling. For example, a researcher may decide to draw the entire sample from one "representative" city, even though the population includes all cities. When using this method, the researcher must be confident that the chosen sample is truly representative of the entire population.

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Answer:

120°; 240°

Step-by-step explanation:

Let's first solve for cosx: 2cosx=-1 \rightarrow cosx=-\frac12 At this point it's just a matter of drawing a circle, and mark where the angle is(please excuse my paint skills, but free hand drawing would be even worse). Red line, is -\frac12 on the cosines, and both the green and blue lines are valid solutions. The green line is a quarter of a circle, plus 30°, or 120°. The blue one is 3/4 of a circle, minus 30 degrees, or 240°.

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because an item is slightly dameged, a stock clerk reduced the price by $6. this represents 15% reduction.what was the original
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3 years ago
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Step-by-step explanation:

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h>27

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