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Step2247 [10]
4 years ago
5

Greg wants to move out of his dormitory and into an apartment near his college. His parents agreed, on the condition that the re

nt is no more than 25% of the cost of dorm living. To get an idea of rent amounts for one-bedroom apartments, Greg looks at listings in a local newspaper and on an Internet site.Which answer best describes the sample and population?A. Sample: all available apartments near the collegePopulation: all available dormitories near the collegeB. Sample: all available apartments near the collegePopulation: listings in a local newspaper and on an Internet siteC. Sample: listings in a local newspaper and on an Internet sitePopulation: all available apartments near the collegeD. Sample: all available dormitories near the collegePopulation: all available apartments near the college
Mathematics
1 answer:
Harman [31]4 years ago
4 0

Answer:

C. Sample: listings in a local newspaper and on an Internet sitePopulation: all available apartments near the college

Step-by-step explanation:

The sample is the set of information Greg collects to do his estimation. The sample is necessarily a subset of the population. That is, in this case, the apartments listed in the local newspaper and the internet. He will estimate a mean rent for the sample and, with this result, estimate the population mean rent.

The population is the bigger set available for Greg to do the estimation, and the set he wants to estimate a parameter from (in this case, the mean rent).

In this case, the population is all the apartments near the college.

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What are the solution(s) to the quadratic equation x² - 25 = 0?
gtnhenbr [62]

Answer:

x = ±5

Step-by-step explanation:

x² - 25 = 0

x² = 25

√x² = √25

x = ±5

Check:

5² - 25 = 0

-5² - 25 = 0

25 - 25 = 0

4 0
2 years ago
A used book store also started selling used CDs and videos. In the first week, the store sold 40 used CDs and videos, at 4.00 pe
masha68 [24]

Answer:

30 CDs and 10 Videos were sold.

Step-by-step explanation:

Given that a used book store also started selling used CDs and videos. In the first week, the store sold 40 used CDs and videos, at 4.00 per CD and 6.00 per video.

The sales for both CDs and videos totaled to 180.00.

Let CDs be x and Videos be y

Then we have x+y =3040

and 4x+6y = 180

Two simultaneous equations in two variables and can be solved by elimination method

multiply I equation by 4 and subtract from II.

2y = 20

y =10

x = 30

30 CDs and 10 Videos were sold.

4 0
3 years ago
A manufacturer of running shoes knows that the average lifetime for a particular model of shoes is 15 months. Someone in the res
Alexus [3.1K]

Answer:

Step-by-step explanation:

Hello!

So you have a new type of shoe that lasts presumably longer than the ones that are on the market. So your study variable is:

X: "Lifetime of one shoe pair of the new model"

Applying CLT:

X[bar]≈N(μ;σ²/n)

Known values:

n= 30 shoe pairs

x[bar]: 17 months

S= 5.5 months

Since you have to prove whether the new shoes last more or less than the old ones your statistical hypothesis are:

H₀:μ=15

H₁:μ≠15

The significance level for the test is given: α: 0.05

Your critical region will be two-tailed:

Z_{\alpha /2} = Z_{0.025}= -1.96

Z_{1-\alpha /2} = Z_{0.975}= 1.96

So you'll reject the null Hypothesis if your calculated value is ≤-1.96 or if it is ≥1.96

Now you calculate your observed Z-value

Z=<u>x[bar]-μ</u> ⇒ Z=<u>    17-15     </u> = 1.99

     σ/√n              5.5/√30

Since this value is greater than the right critical value, i.e. Zobs(1.99)>1.96 you reject the null Hypothesis. So the average durability of the new shoe model is different than 15 months.

I hope you have a SUPER day!

5 0
3 years ago
Type the missing number that makes these fractions equal:<br><br> 4<br> 10<br> = <br> 2.
olasank [31]

Answer: I assume this ques was formatted like this originally. 4/10 = 2. If so the answer is 5 making the second fraction 2/5. Let me know if this is not the case. Hope this helps!

6 0
3 years ago
The area of inner total surface of acubical water tank is 54m². How m3 many of water does it hold?​
klio [65]

Answer:

0

Step-by-step explanation:

54m² - 54m² = 0

Water is 0

6 0
1 year ago
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