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oksian1 [2.3K]
2 years ago
8

The mean on a statewide biology test was 76 with a standard deviation of 11. Harris county sampled the scores of some of its stu

dents and reported a mean of 80 with a margin of error of ± 2.3.
What is the range of reasonable means for Harris County's sample?

Range: ____ to ____
Mathematics
1 answer:
sveticcg [70]2 years ago
3 0

The margin of error would tell how many percentage differs from  Harris County's sample

The range of reasonable means for Harris County's sample is 77.7 to 82.3

<h3>How to determine the range?</h3>

The given parameters are:

  • Population mean, \mu = 76
  • Population standard deviation, \sigma = 11
  • Sample mean, \bar x = 80
  • Margin of error , E = 2.3

The range (R) is calculated as:

R = \bar x \pm E

Substitute known values

R = 80 \pm 2.3

Expand

R = (80 - 2.3,80 + 2.3)

Evaluate the difference and sum

R = (77.7,82.3)

Hence, the range of reasonable means for Harris County's sample is 77.7 to 82.3

Read more about margin of error at:

brainly.com/question/25690706

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Answer:

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<em>Additional comment</em>

As with any statement of percentage, you need to be very clear about what the base is.

Here, 100% is the number of farms in 2005, so an increase of 40% per year is an increase by 40% of the number in 2005. That is very different from 40% of the number in the previous year, which is how an annual percentage increase is usually interpreted. (The average annual rate of change is closer to 24% with respect to the previous year's number.)

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3 years ago
Choose the equation for the red graph
Leona [35]

The red line is a reflection across the x-axis, so the correct option is d.

<h3>How to write the equation for the red line?</h3>

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This reflection only changes the sign of the right side, then we get that the function of the red line is:

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Like in option d, so that is the correct one.

If you want to learn more about reflections:

brainly.com/question/4289712

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3 0
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