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Yuki888 [10]
2 years ago
11

HELP ASAP PLEASE! 30 POINTS GIVEN

Mathematics
2 answers:
mash [69]2 years ago
7 0

Answer:

C. and D. are the answers

Step-by-step explanation:

inna [77]2 years ago
4 0
The answers would be
C. Spreads: The ages of the koi are more spread out
D. Centers: The sharks have a lower median range than the koi.
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What is the area of the drumhead on the drum shown below? Round to the nearest 10th.14 inches
Maurinko [17]
The formula for finding the area of a circle is

a = pi × radius^2

Since the diameter is 14 inches, the radius is 7 inches, so to solve...

a = pi × 7^2
a = 3.14 × 49
a = 153.86

Rounded to the nearest tenth...

153.9 inches^2
5 0
3 years ago
What is the sine and cosine of A?
valkas [14]
Sin is opposite over hypotenuse, so sin(A) = 4/5. Cos its adjacent over hypotenuse, so cos(A) = 3/5
3 0
3 years ago
One half of a number is eight
sergey [27]

Answer:

16

Step-by-step explanation:

8 0
2 years ago
The CEO of a large manufacturing company is curious if there is a difference in productivity level of her warehouse employees ba
blsea [12.9K]

Answer:

The test statistic is z = -2.11.

Step-by-step explanation:

Before finding the test statistic, we need to understand the central limit theorem and subtraction of normal variables.

Central Limit Theorem

The Central Limit Theorem establishes that, for a normally distributed random variable X, with mean \mu and standard deviation \sigma, the sampling distribution of the sample means with size n can be approximated to a normal distribution with mean \mu and standard deviation s = \frac{\sigma}{\sqrt{n}}.

For a skewed variable, the Central Limit Theorem can also be applied, as long as n is at least 30.

Subtraction between normal variables:

When two normal variables are subtracted, the mean is the difference of the means, while the standard deviation is the square root of the sum of the variances.

Group 1: Sample of 35, mean of 1276, standard deviation of 347.

This means that:

\mu_1 = 1276, s_1 = \frac{347}{\sqrt{35}} = 58.6537

Group 2: Sample of 35, mean of 1439, standard deviation of 298.

This means that:

\mu_2 = 1439, s_2 = \frac{298}{\sqrt{35}} = 50.3712

Test if there is a difference in productivity level.

At the null hypothesis, we test that there is no difference, that is, the subtraction is 0. So

H_0: \mu_1 - \mu_2 = 0

At the alternate hypothesis, we test that there is difference, that is, the subtraction is different of 0. So

H_1: \mu_1 - \mu_2 \neq 0

The test statistic is:

z = \frac{X - \mu}{s}

In which X is the sample mean, \mu is the value tested at the null hypothesis and s is the standard error.

0 is tested at the null hypothesis:

This means that \mu = 0

From the two samples:

X = \mu_1 - \mu_2 = 1276 - 1439 = -163

s = \sqrt{s_1^2+s_2^2} = \sqrt{58.6537^2+50.3712^2} = 77.3144

Test statistic:

z = \frac{X - \mu}{s}

z = \frac{-163 - 0}{77.3144}

z = -2.11

The test statistic is z = -2.11.

7 0
3 years ago
<img src="https://tex.z-dn.net/?f=%5Csqrt%7Bx%7D%20%2B7-1%3Dx" id="TexFormula1" title="\sqrt{x} +7-1=x" alt="\sqrt{x} +7-1=x" al
Firlakuza [10]
The answer is x = 9 (i hope this helped)
5 0
3 years ago
Read 2 more answers
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