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4 years ago

Please help! This is past due and I don’t know the answer!

Mathematics

1 answer:

sesenic [268]4 years ago

5 0

One way is a simple random sample (SRS) which basically involves putting everyone's name into a hat and drawing out a list of names at random. Or the computer is the one doing the random selections.

Another way is to use cluster sampling. Each cluster would be the various stores. So if you had say 20 stores nationwide, then the company picks a few people at random from each cluster (store) and forms the sample that way. This method ensures that no store is left out, and could possibly be more representative compared to pure SRS which will pick any name at random. With SRS it is possible that some stores are over-represented while others are under-represented or simply represented not at all.

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Side note:

An example of "over-representation" would be having a group of 90% males in a committee when the population at large is roughly 50% male, 50% female.

Under-representation is the complete opposite, so that example would be the 10% of females on the committee (when it should be closer to 50%)

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31. What are the perimeter and area

nexus9112 [7]

Answer:

tbh idek bc the pen pen duck duck duck goose I don't know I'm doing this for the beginning part

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3 years ago

How many positive integers less than 100 have at least one digit that is a 9? (Let T be the set of positive integers less than 1

Ymorist [56]

Answer:

Step-by-step explanation:

Let T be the set of positive integers less than 100 with a 9 in the ten's place.

T = {90, 91, 92, 93, 94, 95, 96, 97, 98, 99}

n(T) = 10

Let O be the set of positive integers less than 100 with a 9 in the one's place.

O = {9, 19, 29, 39, 49, 59, 69, 79, 89, 99}

n(O) = 10

The common element is 99.

$T\cap O={99}$

$n(T\cap O)=1$

The union of both sets is

$n(T\cup O)=n(T)+n(O)+n(T\cap O)$

$n(T\cup O)=10+10-1$

$n(T\cup O)=19$

Therefore, 19 positive integers are less than 100 those have at least one 9.

6 0

4 years ago

Hannah says that 2.11 is a rational number. Gus says that 2.11 is a repeating decimal.

topjm [15]

Answer:

Hannah is correct

Step-by-step explanation:

If it's a repeating decimal, is would be represented by 2.11 ..... But, that's not how it's represented. Therefore, Hannah is correct.

I hope this helps!

7 0

3 years ago

Police use photographs of various facial features help witnesses identify suspects. One basic identification kit contains 195 ha

algol [13]

Answer:

the kit can produce 99*89*105*74 = 68,461,470 faces

Step-by-step explanation:

Hope this helps : )

7 0

4 years ago

he net of a square pyramid is shown: A square is shown having each side equal to 0.25 inch. Each side of the square has a triang

Over [174]

Answer:

0.6625

Step-by-step explanation:

To find the surface area, calculate the area of each shape and add it together, A pyramid has 1 square and 4 triangles in its net,

Area of square is A=s*s=0.25*0.25=0.0625.

Area of a triangle is A= 1/2 b*h = 1/2 (0.25)(1.2) = 0.15.

There are four equal triangles so together there area is 4*0.15 = 0.60.

Add the square to it and you have the surface area of the pyramid.

0.0625 + 0.60 = 0.6625

8 0

3 years ago