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3 years ago

Evaluate 9P2- need to make a good grade

Mathematics

1 answer:

Svetllana [295]3 years ago

3 0

81, if you mean 9 Squared.

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the intersection of the triangle's three altitudes.

Step-by-step explanation:

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3 years ago

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3 years ago

Help !!! please show work so i know how to do it :)))

satela [25.4K]

Answer:

Step-by-step explanation:

the red lines mean the two sides are equal

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3 years ago

Read 2 more answers

Solve for x.

konstantin123 [22]

5x/7 - 5 = 50 is 4. x = 77

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3 years ago

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

viva [34]

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.

5 0

3 years ago