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igor_vitrenko [27]

3 years ago

9

PLEASE HELP ASAP!!!!

1 answer:

Harlamova29_29 [7]3 years ago

3 0

Answer:

D. $y=\frac{1}{4}x$

Step-by-step explanation:

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8 5x=-2 whats the value of the variable?

wlad13 [49]

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Hope this helps

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3 years ago

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Elenna [48]

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8 0

3 years ago

Two students form a group of eight boys and 12 girls are sent to represent the school in a parade. If the two students are chose

ch4aika [34]

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6 0

3 years ago

Read 2 more answers

In Pennsylvania the average IQ score is 101.5. The variable is normally distributed, and the population standard deviation is 15

blsea [12.9K]

Answer:

We conclude that the Pennsylvania school district have an IQ higher than the average of 101.5

Step-by-step explanation:

We are given the following in the question:

Population mean, μ = 101.5

Sample mean, $\bar{x}$ = 106.4

Sample size, n = 30

Alpha, α = 0.05

Population standard deviation, σ = 15

First, we design the null and the alternate hypothesis

$H_{0}: \mu = 101.5\\H_A: \mu > 101.5$

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

$z_{stat} = \displaystyle\frac{106.4 - 101.5}{\frac{15}{\sqrt{30}} } = 1.789$

Now, $z_{critical} \text{ at 0.05 level of significance } = 1.96$

Since,

$z_{stat} > z_{critical}$

We reject the null hypothesis and accept the alternate hypothesis.

Thus, we conclude that the Pennsylvania school district have an IQ higher than the average of 101.5

5 0

3 years ago

If the sum of a number and 5 is doubled , the result is 9 less than the number.

Svetach [21]

Answer:

x=-19

Step-by-step explanation:

2(x+5)=x-9

2x+10=x-9

2x=x-19

x=-19

5 0

3 years ago