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3 years ago

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PLZ PLZ PLZ PLZ PLZ PLZ HELP ME I DONT UNDERSTAANDDDD I NEED ANSWERS SOME OF THEM I ACCIDENTLY CLICKED ON WHEN I TOOK THE PICTUR

E PLZZZZZZZZ

1 answer:

Yuri [45]3 years ago

8 0

Don’t use Brainly for tests that’s cheating. I know its a test cause I.use Canvas too

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Consider the following hypothesis test: H 0: 20 H a: < 20 A sample of 60 provided a sample mean of 19.5. The population stand

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Answer:

We reject the null hypothesis and accept the alternate hypothesis. Thus, it be concluded that the population mean is less than 20.

Step-by-step explanation:

We are given the following in the question:

Population mean, μ = 60

Sample mean, $\bar{x}$ = 19.5

Sample size, n = 60

Alpha, α = 0.05

Population standard deviation, σ = 1.8

First, we design the null and the alternate hypothesis

$H_{0}: \mu = 20\\H_A: \mu < 20$

We use One-tailed z test to perform this hypothesis.

Formula:

$z_{stat} = \displaystyle\frac{\bar{x} - \mu}{\frac{\sigma}{\sqrt{n}} }$

Putting all the values, we have

$z_{stat} = \displaystyle\frac{19.5 - 20}{\frac{1.8}{\sqrt{60}} } = -2.151$

Now, $z_{critical} \text{ at 0.05 level of significance } = -1.64$

Since,

$z_{stat} < z_{critical}$

We reject the null hypothesis and accept the alternate hypothesis. Thus, it be concluded that the population mean is less than 20.

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1/36 + 1/49 = 81 is the standard eq following the formula 1/a.a + 1/b.b = 1/r.r

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Answer:

All the sides given in each question can form triangle because the sum of first two side is greater than third side.

Step-by-step explanation:

In question no 2 there should be yes.

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Step-by-step explanation:

When a figure undergoes a 180degree rotation, both the (x) and (y) coordinates are multiplied by (-1). The coordinates of the given point are (2, 3). Multiply both of these numbers to fine (R'), that is point (R) after it undergoes its rotation. The coordinates of (R') are (-2, -3).

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