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grandymaker [24]
3 years ago
12

Pls who knows how to do this? Make it correct just by adding one line5+5+5=550​

Mathematics
1 answer:
Feliz [49]3 years ago
6 0

the answer shows in the picture

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To obtain information on the corrosion-resistance properties of a certain type of steel conduit, 45 specimens are buried in soil
Debora [2.8K]

Answer:

statistic value t= 5.43

p-value: < 0.00001.

Step-by-step explanation:

Hello!

To obtain information over the corrosion-resistance properties of a certain type of steel conduit a random sample of 45 specimens was taken and buried for two years.

The study variable is:

X: Max. penetration of a steel conduit.

The data of the sample

n= 45

sample mean X[bar]= 53.4

sample standard deviation S= 4.2

The conduits are manufactured to have a true average penetration of at most 50 mills, symbolically: μ ≤ 50

The hypothesis is:

H₀: μ ≤ 50

H₁: μ > 50

α: 0.05

To choose the corresponding statistic to use to study the population mean, the variable must have a normal distribution. There is no available information to check this, so I'll just assume that the variable has a normal distribution and, since the population variance is unknown and the sample is small, the statistic to use is a Student t.

Under the null hypothesis, the critical region and the p-value are one-tailed.

Critical value:

t_{n-1; 1-\alpha } = t_{44; 0.95} = 1.68

Rejection rule:

Reject the null hypothesis when t ≥ 1.68

t= \frac{53.4 - 50}{\frac{4.2}{\sqrt{45} } }

t= 5.43

The calculated value is greater than the critical value, thedecision is to rject the null hypothesis.

p-value:

P(t ≥ 5.43) = 1 - P(t < 5.43) = < 0.00001.

The p-value is less than α so the decision is to reject the null hypothesis.

Since the null hypothesis was rejected, then the population average of the penetration of the conduits specimens is greater than 50 mils. It is not recommendable to use these conduits.

I hope it helps!

4 0
3 years ago
For every 3 strawberries, 1 banana needs to be added to the mixture. The ratio of strawberries to bananas is 3:1. Write this rat
cupoosta [38]

Answer:

ok so the two other ways are- 6:2 and 9:3

And the second part- 5

Step-by-step explanation:

7 0
3 years ago
4/9 expressed as a percent please help and show work! Please
coldgirl [10]
4/9 as a percent is (about) 44%   Work:
First get a decimal by dividing 4/9(4 divided by 9) you get 0.44 repeating
Next, take away the 0. and add a percent sign at the end of 0.44. You get 44%
Truly, the answer is 44.44444...% because the four repeats, but if you round it is simply 44%
7 0
3 years ago
Read 2 more answers
Somebody help me with this plsss it for geometry
ICE Princess25 [194]
Use an online math calculator for more accurate answers just plug in the variables
8 0
2 years ago
-2(x+5)=2 is an example of wich property
denpristay [2]
-2(x + 5) = 2  |use distributive property: a(b + c) = ab + ac

-2x - 10 = 2    |add 10 to both sides

-2x = 12    |divide both sides by (-2)

x = -6
5 0
3 years ago
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