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2 years ago

) On a merry-go-round, 16 horses are evenly spaced on the outside perimeter. Abe is opposite

Mathematics

1 answer:

Nookie1986 [14]2 years ago

3 0

I don’t know ‍♂️ I will be here at church ⛪️ I

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Which of the following is a type of data that is likely to be normally<br> distributed?

kkurt [141]

It is either A or D, but I think it’s A

8 0

2 years ago

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An article presents voltage measurements for a sample of 66 industrial networks in Estonia. Assume the rated voltage for these n

kramer

Answer:

We accept the null hypothesis and conclude that voltage for these networks is 232 V.

Step-by-step explanation:

We are given the following in the question:

Population mean, μ = 232 V

Sample mean, $\bar{x}$ = 231.5 V

Sample size, n = 66

Sample standard deviation, s = 2.19 V

Alpha, α = 0.05

First, we design the null and the alternate hypothesis

$H_{0}: \mu = 232\\H_A: \mu \neq 232$

We use Two-tailed t test to perform this hypothesis.

Formula:

$t_{stat} = \displaystyle\frac{\bar{x} - \mu}{\frac{\sigma}{\sqrt{n-1}} }$ Putting all the values, we have

$t_{stat} = \displaystyle\frac{231.5- 232}{\frac{2.19}{\sqrt{66}} } = -1.8548$

Now,

$t_{critical} \text{ at 0.05 level of significance, 9 degree of freedom } = \pm 1.9971$

Since,

$|t_{stat}| > |t_{critical}|$

We accept the null hypothesis and conclude that voltage for these networks is 232 V.

4 0

2 years ago

Kendra’s work is shown in the table. Where, if anywhere, did Kendra first make a mistake? Steps Kendra’s Work Step 1 Negative 3

natali 33 [55]

Answer:

C : STEP 3

Step-by-step explanation:

JUST DID THIS EQUATION AND GOT IT RIGHT HOPE THIS HELPS

4 0

3 years ago

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Round 4700 to the nearest hundred.

klio [65]

Answer:

4700

Step-by-step explanation:

It's already at the nearest hundred

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2 years ago

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Solve 2cos^2x + cosx − 1 = 0 for x over the interval [0, 2 π ).

alina1380 [7]

Let cos x = a, then
2a^2 + a - 1 = 0,
solving the quadratic equation, we have:
a = 0.5 or -1.

i.e. cos x = 0.5 or cos x = -1
for cos x = 0.5,
x = pi/3, 2pi - pi/3 = pi/3, 5pi/3

for cos x = -1,
x = pi

therefore, x = pi, pi/3, 5pi/3
Answer: B

6 0

2 years ago