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3 years ago

Find the equivalent expression of 1/ 4.4.4

Mathematics

1 answer:

Mama L [17]3 years ago

5 0

Answer:

I think it is -4^3

Step-by-step explanation:

because I say so

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Combine like variables:

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Combine coefficients:

40(x^2)(y^3)

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3 years ago

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2 years ago

7th Grade Math... Please help me ASAP

abruzzese [7]

Answer:

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Step-by-step explanation:

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2 years ago

Sidney surveyed 14 students at her school about their favorite classes. Of the students surveyed, 8 said their favorite class wa

kakasveta [241]

Answer:

4/7

Step-by-step explanation:

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2 years ago

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

elena-14-01-66 [18.8K]

Answer:

P-value = 0.0368

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(right) 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, $z_{critical} \text{ at 0.05 level of significance } = 1.64$

Since,

$z_{stat} > z_{critical}$

We reject the null hypothesis and accept the alternate hypothesis. Thus, students in Pennsylvania have an IQ that is significantly greater than the state average.

P-value can be calculated with the standard normal table.

P-value = 0.0368

P-value is lower than the significance level.

4 0

3 years ago