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Oksana_A [137]
3 years ago
6

james wants to find out the favorite movie of students in his school. Which method would give James the BEST results? A)survey e

very student on the football team B) survey every student that walks to school C) survey only students who go to the movie every week D) survey 100 randomly selected students from the school
Mathematics
2 answers:
kolezko [41]3 years ago
8 0

Answer:

D) Survey 100 randomly selected students from the school

Step-by-step explanation:

This gives an equal chance to everybody, so it's not biased and it is of everybody that goes to his school. A is only the people on the football team so its not students in his school. Walking to school has nothing to do with the survey topic and so thats also definitely not it. C again doesn't give a fair chance to everybody, so it would be possible to get an accurate, unbiased answer. D is definitely your answer!

I hope that helps!!

Have an awesome day! :)

Olin [163]3 years ago
8 0
D. Is your answer because that would be fair.
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Cindy's age, x, is 3 times her age 6 years ago which equation represents the statement x=3(x-6) or x=3-6x or x=3x-6 or x=3x+6
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Let's denote Cindy's age which is unknown with X
We know that Cindy's age is 3 times her age 6 years ago. 
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The fact that the  present age is 3 times her age 6 year ago can be written as:
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3 years ago
How can I simplify these?
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The mean and standard deviation of the number of practices are = 8 practices and sx = 4.47 practices. The mean and standard devi
ddd [48]

Least square regressions are used to find the equation of <em>best fit between two variables</em>.

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The given parameters are:

\mathbf{\bar x = 8}

\mathbf{\sigma_x = 4.47}

\mathbf{\bar y = 7.71}

\mathbf{\sigma_y = 1.20}

\mathbf{r = -0.793}

The equation of the least-squares regression line is represented as:

\mathbf{y = a + bx}

Where:

\mathbf{b = r \times \frac{\sigma_y}{\sigma_x}}

\mathbf{a = \bar y - b\bar x}

So, we have:

\mathbf{b = r \times \frac{\sigma_y}{\sigma_x}}

\mathbf{b = -0.793 \times \frac{1.20}{4.47}}

\mathbf{b = -0.213}

\mathbf{a = \bar y - b\bar x}

\mathbf{a = 7.71 - (-0.213) \times 8}

\mathbf{a = 9.414}

So, the equation is:

\mathbf{y = a + bx}

\mathbf{y = 9.414 - 0.213x}

Read more about equations of least squares regression at:

brainly.com/question/2141008

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2 years ago
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median- 63
mode-63
range-70
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