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3 years ago

What is WZ? Please, and thank you.

Mathematics

1 answer:

Tju [1.3M]3 years ago

8 0

Answer:

WZ=17

Step-by-step explanation:

2(3x+3)=4x-10+6x-16

6x+6=10x-26

10x-6x=6+26

4x=32

x=8

2(4x-10)=3x+3+WZ

WZ=8x-20-3x-3

WZ=5x-23

WZ=5×8-23=17

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Answer:

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(c) Unless our sample (of 81 hospitals) is among the most unusual 2% of samples, the actual mean noise level in hospitals is between 44.41 db and 49.59 db.

Step-by-step explanation:

The problem is incomplete. The questions are:

(a) A 99% confidence interval for the actual mean noise level in hospitals is (44.02 db, 49.98 db).

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For a 90% CI, the value of z is z=1.64.

Then, we can calculate the margin of error as:

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(c) Unless our sample (of 81 hospitals) is among the most unusual 2% of samples, the actual mean noise level in hospitals is between 44.41 db and 49.59 db.

The 2% tails data corresponds, in the standard normal distirbution, to the values of z whose absolute value is higher than 2.33.

The values of db for these critical values are:

$X_1=M+z_1*\sigma/\sqrt{n}=47+(-2.33)*10/\sqrt{81}=47-2.59=44.41\\\\\\ X_2=M+z_2*\sigma/\sqrt{n}=47+(2.33)*10/\sqrt{81}=47+2.59=49.59$

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Answer:

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Step-by-step explanation:

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