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scoundrel [369]
4 years ago
13

Suppose you want to know whether the eighth-grade music students at a school spend more time practicing their instruments or pla

ying computer games. Explain how you would get a representative sample from the population.
Mathematics
2 answers:
valentinak56 [21]4 years ago
6 0

Answer:

Step-by-step eAcquiring a list of all the names of eighth-grade music students (the population).

Selecting some of the eighth-grade music students at random.

Selecting enough students to get a good sample for the population, but not every student.

Making sure the selection of students is completely random to get valid results and avoid a biased sample.

lorasvet [3.4K]4 years ago
3 0
<span> Get a list of all the music students in the eighth grade. Randomly select enough students to get a sample from the population. Ensure that the selection is completely random so the sample is not biased.</span>
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Sally likes 225 but not 224; she likes 900 but not 800; she likes 144 but not 145. which does she like - 1600 or 1700?
Pavel [41]

All of Sally's "likes" are squares: 225 = 15², 900 = 30², 144 = 12²

1600 = 40²

Sally "likes" 1600

3 0
3 years ago
n engineer designed a valve that will regulate water pressure on an automobile engine. The engineer designed the valve such that
BartSMP [9]

Answer:

<em>The calculated t- value =  1.11 > 2.89 at 0.025 level of significance</em>

<em>Null hypothesis is rejected </em>

<em>The engineer designed the valve such that it would produce a mean pressure is not equal to  5.4</em>

Step-by-step explanation:

<u><em>Step(i):-</em></u>

<em>Given mean of the Population (μ) = 5.4</em>

<em>Given sample size 'n' = 9</em>

<em>Mean of the sample (x⁻) = 5.7</em>

<em>Standard deviation of the sample (s) = 0.81</em>

<u><em>Step(ii):-</em></u>

<em>Null Hypothesis: H₀:</em>  The engineer designed the valve such that it would produce a mean pressure of 5.4

H₀: μ = 5.4

<em>Alternative Hypothesis : H₁:</em>  μ ≠ 5.4

Level of significance = 0.025

Test statistic

            t = \frac{x^{-} -mean}{\frac{S}{\sqrt{n} } }

           t = \frac{5.7 -5.4}{\frac{0.81}{\sqrt{9} } }

         t = 1.11

<em>Degrees of freedom </em>

<em>ν = n-1 = 9-1 =8</em>

t₀.₀₁₅ , ₈  = 2.89

<em>The calculated t- value =  1.11 > 2.89 at 0.025 level of significance</em>

<em>Null hypothesis is rejected </em>

<em>The engineer designed the valve such that it would produce a mean pressure is not equal to  5.4</em>

<em></em>

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7 0
3 years ago
PLS HELP ASAP THANKS ILL GIVE BRAINLKEST PLS THANKS PLS ASAP
Margaret [11]

Answer:

$13

Step-by-step explanation:

Let's set up a ratio...

2:3.25

8:x

We know 2*4 is 8 so we need to multiply 3.25 by 4 to get x...

3.25*4=$13

5 0
2 years ago
Kim bought 1.5 pounds of American cheese that cost $4.50 per pound. She also bought 1.75 pounds of Swiss cheese that cost $4.80
Fed [463]

Answer:

$0.55

Step-by-step explanation:

1.5+4.50=6

1.75+4.80 =6.55

6-6.55=0.55

3 0
4 years ago
64 w^2 + 96w+36=0. What is the number of real solutions?
7nadin3 [17]

Answer:

w = -3/4 or -0.75

there is only one solution

Step-by-step explanation:

4 0
3 years ago
Read 2 more answers
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