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FrozenT [24]
3 years ago
9

Adriana, Henry, Malik, and Richard each design surveys to determine the most popular way seventh graders purchase music. Adriana

samples the five friends sitting at her lunch table. Henry samples every boy in his homeroom class. Malik samples every student using an MP3 player while waiting for the bus. Richard samples the first student alphabetically on the class roster from each of 12 classes. Which sample is likely to produce the most valid results? Adriana’s sample Henry’s sample Malik’s sample Richard’s sample
Mathematics
2 answers:
Marizza181 [45]3 years ago
8 0
<h2><em>the answer is Richard's sample on E2020</em></h2>
andriy [413]3 years ago
7 0
The sample which is likely to produce the most valid result is Richard's sample because there was no statistical bias. Statistical bias is the systematic favoritism of certain individuals in the study. Just like what Adriana, Henry and Malik did in conducting their surveys, they choose people who are point of interest and also who are near them. In the way Richard conducted his survey, he used a random sampling technique, this is a method of selecting a sample from a population in such a way that every possible individual can be chosen and he doesn't know who these people are.
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Shanelle invested $10,000, and at the end of 1 year, she received $805 in interest. She invested part of the money in an account
andrew-mc [135]
10$ because i worked it out and valedictorian in my math class so listen to me yeah
8 0
2 years ago
A plan for an executive traveler's club has been developed by an airline on the premise that at least 5% of its current customer
STatiana [176]

Answer:

a) 3.0779

b)2.3264

Step-by-step explanation:

Please see attachment .

7 0
2 years ago
How to explain whats 4.5 ÷ 5 =
Lerok [7]

Answer:

0.9

Step-by-step explanation:

because if you multiply 0.9 by 5 it equals 4.5, why?

well 0.9 isn't a full number it's not even 1!

If you multiply

5 × 1 = 5

so if you multiply what's smaller than 1 by 5

5 × 0.9 = 4.5

Hope this helps!

Have a nice day!

If you find my answer helpful

<em>Pls consider marking my answer as </em><em>Brainliest</em><em>! It would mean a lot!</em>

8 0
2 years ago
. The National Sleep Foundation surveyed representative samples of adults in six different countries to ask questions about slee
scoundrel [369]

Answer:

Yes the conclusion in the question  is a reasonable conclusion

Step-by-step explanation:

From the question we are told that

    The sample size is  n_1 = n_2 = n = 250

     The sample mean for USA is  \= x_1 =  391 \ minutes

     The sample mean for Mexico is \= x_2 = 426 \ minutes

     The sample standard deviation for USA is  s_1 =  25 \ minutes

    The sample standard deviation for Mexico is  s_2 =  49 \  minutes

     

The null hypothesis is  H_o  :  \mu_1 = \mu_2

The alternative hypothesis is  H_a  :  \mu_1  < \mu_2

Generally the test statistics is mathematically represented as

        z =  \frac{\= x_1 - \= x_2 }{ \sqrt{ \frac{s_1^2}{n_1} + \frac{s_2^2}{n_2 } } }

=>     z =  \frac{ 391  - 426  }{ \sqrt{ \frac{25^2}{250} + \frac{49^2}{250} } }

=>     z =  -10

From the z table  the area under the normal curve to the left corresponding to   -10  is

    p-value =  P(Z <  -10 ) =  0.00

Generally from the value obtained we see that

  The p-value is  <  \alpha  hence

The decision rule is

Reject the null hypothesis

The conclusion is  

 The is sufficient evidence to conclude that adults in the United States get less sleep on work nights than adults in Mexico

Hence the conclusion in the question is a  reasonable conclusion

6 0
3 years ago
Reduce 65 in ratio 5:2
andrezito [222]

Answer: 46.42:18.57

Step-by-step explanation:

5+2 = 765/7 × 5 = 46.4265/7 × 2 = 18.57∴ 65 in the ratio 5:2 =  46.42:18.57x^{2}

3 0
3 years ago
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