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4 years ago

12

Evaluate the numerical expression 30 - [(9x3) - (3 x 4)] and [(25 - 11) + (15 - 9)] divided by five. (These are two questions, g

iving 5-10 points for this)

1 answer:

Inessa [10]4 years ago

4 0

1. 15
2.8/5

hope this helps

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A bakery offers a sale price of 3.50 for 4 muffins.What is the price per dozen

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1
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10 .50

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3 years ago

The carnival fundraiser at Westville Elementary School raised $300 on Friday. On Saturday, the carnival will raise 480 percent o

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Answer:

your answer for 300+480=780 . that was on Saturday , now you have $780 the carvinal..raised 1480 .

Step-by-step explanation:

tell me if I'm wrong thank u (:

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4 years ago

Determine, to one decimal place, the length, width & height of the rectangular prism that would have the greatest volume, wi

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Answer:

The length = The width = The height ≈ 5.8 cm

Step-by-step explanation:

The volume of a rectangular pyramid, V = l × w × h

The surface area of the pyramid = 2 × l × h + 2 × w × h + 2 × l × w = 200

∴ l × h + w × h + l × w = 200/2 = 100

We have that the maximum volume is given when the length, width, and height are equal and one length is not a fraction of the other. Therefore, we get;

At maximum volume, l = w = h

∴ l × h + w × h + l × w = 3·l² = 100

l² = 100/3

l = 10/√3

Therefore, the volume, v = l³ = (10/√3)³

The length = The width = The height = 10/√3 cm ≈ 5.8 cm

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3 years ago

A one-sided hypothesis test is to be performed with a significance level of 0.05. Suppose that the null hypothesis is false. If

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Answer:

E) The probability of a Type II error would increase and the power of the test would decrease.

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3 years ago

A sample ofn = 25 scores has a mean of M = 83 and a standard deviation ofs = 15.

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Answer:

a) The Sample Standard deviation "measures the spread of a data distribution. It measures the typical distance between each data point and the mean"

b) $SE=\frac{15}{\sqrt{25}}=3$

Step-by-step explanation:

Previous concepts

The central limit theorem states that "if we have a population with mean μ and standard deviation σ and take sufficiently large random samples from the population with replacement, then the distribution of the sample means will be approximately normally distributed. This will hold true regardless of whether the source population is normal or skewed, provided the sample size is sufficiently large".

Normal distribution, is a "probability distribution that is symmetric about the mean, showing that data near the mean are more frequent in occurrence than data far from the mean".

Let X the random variable who represents the scores. We know from the problem that the distribution for the random variable X is given by:

$X\sim N(\mu =83,\sigma =15)$

We take a sample of n=25 nails.

From the central limit theorem we know that the distribution for the sample mean $\bar X$ is given by:

$\bar X \sim N(\mu, \frac{\sigma}{\sqrt{n}})$

Part a

The Sample Standard deviation "measures the spread of a data distribution. It measures the typical distance between each data point and the mean"

Part b

The standard error is given by:

$SE=\frac{\sigma}{\sqrt{n}}$

And replacing we got:

$SE=\frac{15}{\sqrt{25}}=3$

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3 years ago