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2 years ago

Question 9 of 10

SAT

2 answers:

notka56 [123]2 years ago

5 0

Answer:

D - education.

Please give me brainliest! you would get 25% as well!

jenyasd209 [6]2 years ago

3 0

Education needs more minority teachers and offers grant opportunities.
Hope you have a great day.

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Which activity is not something students are required to do on the act reading test

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Revise a passage to fix punctuation

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After reviewing the results of a math test, the teacher tells the class that those students who completed their review worksheet

Vsevolod [243]

The option that best describes how the teacher likely came to this conclusion is that:

The teacher conducted an observational study by comparing the performance on the test of those who completed their review worksheets to those who did not complete their review worksheets.

<h3>What is observational study?</h3>

An observational study is known to be a kind of study where a researcher do observes the subjects without having any form of interference with them.

Here, the researcher is said to have no control over any of the treatments that is used on the subjects. All the have to do is observe and record their findings.

See options below

A. The teacher conducted an observational study by comparing the performance on the test of those who completed their review worksheets to those who did not complete their review worksheets.

B. The teacher conducted a sample survey by asking students if they completed their review worksheets and if they think they did well on the test.

C. The teacher performed a controlled experiment in which one group of students decided not to complete their review worksheets and the other group decided to complete their review worksheets.

D. The teacher performed a random experiment in which the test scores of one group of students would be higher and the test scores of the other group would be lower.

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2 years ago

A man went outside in the pouring rain with no protection, but not a single hair on his head got wet. How come?

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Compute the range and sample standard deviation for strength of the concrete (in psi).

irina [24]

Answer:

$Range = 1150\ psi$

$Standard\ Deviation = 442.3\ psi$

Explanation:

Given

3920, 4090, 3300, 3100, 2940, 3830, 4090, 4030

Required

- Determine the Range

- Determine the Standard Deviation

Calculating the Range...

The Range is calculated using the following formula;

$Range = Highest\ Strength - Least\ Strength$

From the given data;

$Highest\ Strength = 4090\\ Least\ Strength = 2940$

Hence,

$Range = 4090 - 2940\\\\Range = 1150\ psi$

Calculating the Standard Deviation...

Start by calculating the mean

$Mean = \frac{\sum x}{n}$

Where x->3920, 4090, 3300, 3100, 2940, 3830, 4090, 4030

n = 8

$Mean = \frac{3920 + 4090 + 3300 + 3100+ 2940+ 3830+ 4090+4030}{8}$

$Mean = \frac{29300}{8}$

$Mean = 3662.5$

Subtract the mean from each observation

$3920 - 3662.5 = 257.5\\4090 - 3662.5 = 427.5\\3300 - 3662.5 = -362.5\\3100 - 3662.5 = -562.5\\2940 - 3662.5 = -722.5\\3830 - 3662.5 = 167.5\\4090 - 3662.5 = 427.5\\4030 - 3662.5 = 367.5$

Square the result of the above

$257.5^2 =66,306.25\\427.5^2 =182,756\\-362.5^2 =131,406.25\\-562.5^2 =316,406.25\\-722.5^2 =522,006.25\\167.5^2 =28,056.25\\427.5^2 =182,756.25\\367.5^2 =135,056.25$