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Gnesinka [82]
3 years ago
11

It is known that the population variance is 144. At 95% confidence, what sample size?a. 22.b. 23.c. 24.d. 25.e. none of the abov

e.
Mathematics
1 answer:
romanna [79]3 years ago
3 0

Answer:

(E) None of the above

Step-by-step explanation:

The statistic provided is that of the population but the statistic you seek is that of the sample.

Looking at the statistic itself, Variance is the square of Standard Deviation or standard deviation is the square root of variance.

Hence you calculate the standard deviation of the population mean:

√144 = 12

The population standard deviation of/from the mean value is 12.

It could be possible to decipher the sample mean from population mean but not sample size.

So, you can't pick just any answer. Population size should be given first.

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CAN YOU ANSWE QUESTION 1 and 2 please??
Svetllana [295]

Answer:

B. $700

Step-by-step explanation:

The answer is A because.....

Step 1: Find the 7% of 2000.

a.) 7% of 2000 is 140.

b.) Check- So: 140/2000= 0.07 (7%)

Step 2: Multiply 140x5 which equals $700.

Although, I can’t really see the second question‘s options, as the calculations made for the previous question, she paid $140 each year.

I rlly hope this is helpful! If so, please, please, please mark brainliest! Thanks! :)

5 0
3 years ago
Can someone plz tell me!!?
dezoksy [38]

Answer:

I'm going with B, but i did some research.

Step-by-step explanation:

6 0
4 years ago
A rectangular pyramid has a volume of 210 cubic centimeters. Find two possible sets of measurements for the base area and height
MrRa [10]
To find 2 possible sets of dimensions you will use the formula for finding the volume of a prism.

V = 1/3Bh, where B is the area of the base.

210 = 1/3Bh
630 = Bh; this means the area of the B time the height must equal 630
  
Find 3 factors that will give you 630.

Ex #1:  10 cm (length) x 6 cm (width) x 9 cm (height)

Ex #2: 5 cm (length) x 9 cm(width) x 14 cm(height)

6 0
3 years ago
Read 2 more answers
the sum of three numbers is 6. the third number is the sum of the first and second numbers. the first number is one more than th
bazaltina [42]

Answer:

x = 4

y = -1

z = 3

Step-by-step explanation:

Let 1st number = x

Let 2nd number = y

Let 3rd number = z

x+y+z=6

x+y=z

x=z+1

(Apply Simultaneous Equations)

Hence:

z+z=6

2z=6

z=6/2

z=3

Now:

x+y=3

x=3+1

x=4

Now:

4+y=3

y=3-4

y=-1

5 0
3 years ago
Help plz on this question?
Nookie1986 [14]
The carrot patch is a 2 by 5 rectangle so 2 times 5 is 10 so the answer is A
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3 years ago
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