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Lubov Fominskaja [6]
3 years ago
9

A simple random sample of 90 is drawn from a normally distributed population, and the mean is found to be 138, with a standard d

eviation of 34. What is the 90% confidence interval for the population mean? Use the table below to help you answer the question.
Mathematics
2 answers:
Naddik [55]3 years ago
8 0
The critical values for a 90% confidence interval are approximately \pm1.645, so the confidence interval in this case is roughly

138\pm1.645\dfrac{34}{\sqrt{90}}=(132.1,143.9)
Eva8 [605]3 years ago
7 0

Answer:

Step-by-step explanation:

Given that A simple random sample of 90 is drawn from a normally distributed population, and the mean is found to be 138, with a standard deviation of 34.

Confidence level = 90%

Z critical value = 1.645

Sample size n=90

Std error of sample = sigma/sqrt n= 34/9.487

=3.583

Margin of error = ±1.645(3.583)=5.895

Hence confidence interval lower bound = 138-5.895 = 132.105

Upper bound = 138+5.895 = 143.895

Hence confidence interval = (132.11, 143.90)

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anyanavicka [17]
You do 9x27=243 then take 2x31=62 add 243+62=305 then take 305 and subtract it from 28 305-28=277 
so if i did it right you should get n=277
8 0
3 years ago
Kayla says that the point labeled C in the diagram below is the center. Raymond says that point C is the radius.
frutty [35]

Answer:

Kayla is correct The center is a fixed  point in the middle of the sphere

Step-by-step explanation:

In mathematics we have certain habit of rules for notation of points, coordinates, segments, angles and so on.

Usually we denote points,  by letters even more we denote with the first letter of the object we are denoting

Occasionally, we also denote  segments as radius in a circle and in a sphere, with letters,  that is r stands for  radius, h stands for height, in most cases we denote point for capital letters ( in a segment)  

When we denote radius, with small letter it should be placed at the center or over the segment we are traying to denote.

For points we only need to place the letter close to the to the point we want to denote.

Therefore Kayla is correct when says that c stand for " the center of the sphere"

8 0
3 years ago
Read 2 more answers
19c10x42c4/61c14 what would that equal to?
Pavlova-9 [17]

1680/61c2      Step-by-step explanation:

3 0
3 years ago
Which expression is equivalent to cot t sec t?
Solnce55 [7]

Answer: csc(t)

Step-by-step explanation:

Alright, lets get started.

The given expression is given as :

cot( t) \times sec (t)

We know quotient identity as :

cot(t)=\frac{cos(t)}{sin(t)}

Similarly, we know reciprocal identity as :

sec(t)=\frac{1}{cos(t)}

lets plug the value of cot and sec in given expression

\frac{cos(t)}{sin(t)}  \times \frac{1}{cos(t)}

cos will be cancelled, remaining will be

\frac{1}{sin(t)}

Using reciprocal identity again, that will equal to :

csc(t)  ................... Answer (A)

8 0
3 years ago
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hichkok12 [17]

Answer:

Correct choice is A

Step-by-step explanation:

For the numbers 13 and 88, find the difference 88-13:

since 88-13=75 and \dfrac{75}{3}=25 (two arithmetic means tells you there will be three intervals), two arithmetic means will be

  • 13+25=38;
  • 38+25=63.

The only correct sequence is 13, 38, 63, 88.


7 0
3 years ago
Read 2 more answers
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