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2 years ago

Please help I’m struggling rlly bad w this

Mathematics

1 answer:

Rzqust [24]2 years ago

7 0

if we convert 6/8 to a smaller fraction it became 3/4. then, if we convert 27/36, it became 3/4. so, 6/8 os equivalent with 27/36. so the answer is 216=216

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Mini made a recipe that yields 4 and 1 over 2 cups. If each serving is 1 over 2 cup, which expression will help Mini determine t

Katarina [22]

4 and 1 over 2 ÷ 1 over 2

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3 years ago

Read 2 more answers

PLEASE HELP FAST !!

hoa [83]

Answer:

in explanation

Step-by-step explanation:

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Bro this is easy you dont need Brainly for this just read it carefully and look at the graph.

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2 years ago

The strength of a certain type of rubber is tested by subjecting pieces of the rubber to an abrasion test. For the rubber to be

My name is Ann [436]

Answer:

Step-by-step explanation:

Hello!

You have the hypothesis that the average weight loss for rubber after an abrasion test is less than 3.5 mg. To test this a large sample of pieces of rubber were sampled and subjected to the abrasion test.

With the given information you must test whether the researcher's hypothesis is sustained or not.

The study variable is,

X: Weight loss of rubber cured in a certain way after being subjected to the abrasion test. (mg)

There is no information about the variable distribution, but since it is said that the sample is a "large number" I'll take it as if it is bigger than 30 and apply the Central Limit Theorem to use the approximation of the sample mean to normal. This way I can use the Z-statistic for the test.

Symbolically the statistic hypothesis is:

H₀: μ ≥ 3.5

H₁: μ < 3.5

α: 0.05 (since is not listed, I'll choose one of the most common signification levels)

You have a one-tailed critical region, this means the p-value will also be one-tailed to the left of the distribution (i.e. →-∞)

The formula of the statistic is:

Z= X[bar] - μ ≈ N(0;1)

δ/√n

To calculate the statistic you have to use the information given.

The sample mean X[bar]= 3.4 mg

Upper bond of 95% CI= 3.45 mg

The basic structure of a CI for the mean is

"estimator" ± "margin of error"

Upper bound is "estimator" + "margin of error"

Using the formula:

Ub= X[bar] + d ⇒ 3.45= 3.4 + d

⇒ d= 3.45 - 3.4 = 0.05

Where d is the margin of error

d= $Z_{1-\alpha /2}$ * (δ/√n)

d= $Z_{0.975}$ * (δ/√n)

d/ $Z_{0.975}$ = (δ/√n)

(δ/√n)= 0.05/ 1.96 = 0.0255

(δ/√n) is the denominator in the formula, corresponds to the standard deviation of the distribution.

Now you have all values and can calculate the statistic under the null hypothesis:

Z= 3.4 - 3.5 = -3.92

0.0255

And the p-value:

P(Z ≤ -3.92) = 0.000044 ⇒ My Z- table goes up to P(Z ≤ -3.00) = 0.001, so using strictly the table I can say that the probability is less than 0.001.

To calculate the exact probability I've used a statistic program.

p-value < 0.001

I hope it helps!

8 0

2 years ago

Help me plzzzzzzzzzz

wolverine [178]

Its 130°

Heheheheh because 25+25=50
180-50=130

8 0

2 years ago

3, 12, 48, 192, 768, . . . This sequence has a?

nydimaria [60]

Answer:

common ratio is 4

Step-by-step explanation:

3, 12, 48, 192, 768, . . .

LEts find the common difference

$12-3= 9$

$48-12= 36$

There is no common difference

LEts find out common ratio by dividing the second term by first term

$\frac{12}{3} =4$

$\frac{48}{12} =4$

$\frac{192}{48} =4$

So common ratio is 4

8 0

2 years ago