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Korvikt [17]
3 years ago
10

A researcher initially plans to take an SRS of size 160 from a certain population and calculate the sample mean. Later, the rese

archer decides to increase the sample size so that the standard deviation of the sampling distribution of will be half as big as when using a sample size of 160.
What sample size should the researcher use?
Mathematics
1 answer:
lara [203]3 years ago
3 0

Answer:

640

Step-by-step explanation:

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Rudik [331]
Its a little blurry and i need glasses so can u take another pic

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One side of a roof is in the shape of a trapezoid (similar to the one on Pizza Hut). The top row requires 10 shingles, the secon
larisa [96]
<span> It would depend on the number of rows?

This is an arithmetic sequence and the sum of n terms is --> n/2(2a+(n-1)d), where a is the first term and d is the common difference. In this case a = 10, d =6

n/2(20+6(n-1)) = 3n^2 + 7n = ANSWER

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6 0
3 years ago
What is the sum of q and 8
Vera_Pavlovna [14]
Is there any more information, such as the value of q? Otherwise the sum of q and 8 is q + 8 because "sum" indicates addition.
7 0
3 years ago
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Hii please help i’ll give brainliest
Novosadov [1.4K]
I think the answer would be 1/2 but i’m not sure if that’s what it’s asking
4 0
3 years ago
Find the answer given below​
Anastasy [175]

Answer:

Surface area = 6l^2

Volume = l^3

If total surface area increased by 2, then the length increased by \sqrt{2}

Volume then is increased by (\sqrt{2}l)^3 = 2\sqrt{2}l^3

1 :2 \sqrt{2}

Which is not an option in the question so this question clearly has a problem.

First of all It's supposed to be "then" not "than," so I'm not sure who teaches math without even knowing this basic grammar.

Second of all, if the answer is 8:1 the question should be "If <u>each sides</u> of a cube is doubled" not "the lateral surface area." Come to think of it what even is lateral surface area of a cube if all sides of the cube is supposed to be same.

Or, if the answer is 2:1 then, it should be If height lateral surface area of a cube is doubled <u>by doubling the height and without changing the length and width</u>"  But, then the the shape would no longer be a cube.

Who even wrote this garbage question what.

6 0
3 years ago
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