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sp2606 [1]
3 years ago
5

In a geomatric sequence, a5= 36 and a7=16

Mathematics
1 answer:
Anettt [7]3 years ago
4 0
Hello,

a_{5}=36
a_{6}=36*r
a_{7}=36*r^2=16
==>r²=16/36=4/9

==>r=2/3 or r=-2/3


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Fatheya purchased a prepaid phone card for $25. Long distance calls cost 12 cents a minute using this card. Fatheya used her car
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Answer:

22 minutes

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3 years ago
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

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sample standard deviation S= 4.2

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The hypothesis is:

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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:

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

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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!

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3 years ago
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Read 2 more answers
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liberstina [14]

Answer:

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