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nordsb [41]
2 years ago
10

3x + 3 = 2x + 12 i need help for this answer

Mathematics
2 answers:
Flura [38]2 years ago
6 0

Answer:

x=9

Step-by-step explanation:

jonny [76]2 years ago
4 0

Answer:

X=9

Step-by-step explanation:

3x+3=2x+12

3x-2x=12-3

x=9

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tekilochka [14]

Answer:

a) ii. This is a left-tailed test.

b) -1.59

c) -1.301

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Step-by-step explanation:

We are given the following in the question:  

Population mean, μ = 7 hours

Sample mean, \bar{x} = 6.87 hours

Sample size, n = 45

Alpha, α = 0.10

Sample standard deviation, s =  0.55 hours

First, we design the null and the alternate hypothesis

H_{0}: \mu = 7\text{ hours}\\H_A: \mu < 7\text{ hours}

a) We use one-tailed(left) t test to perform this hypothesis.

b) Formula:

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

Putting all the values, we have

t_{stat} = \displaystyle\frac{6.87 - 7}{\frac{0.55}{\sqrt{45}} } =-1.59

c) Now,

t_{critical} \text{ at 0.10 level of significance, 44 degree of freedom } = -1.301

Since,                    

t_{stat} < t_{critical}

d) We fail to accept the null hypothesis and reject it.

We accept the alternate hypothesis and conclude that  mean number of hours of sleep for all college students is less than 7 hours.

e) Option i) The data supports the claim that college students get less sleep than the general population.

8 0
3 years ago
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topjm [15]
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balandron [24]

Answer:

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Step-by-step explanation:

Take the fraction and simplify it:

12/4 = 3/1

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