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topjm [15]
2 years ago
13

Helppppppppppppppppp​

Mathematics
2 answers:
tatiyna2 years ago
7 0

Answer:

-4 , 3,3-9,12

Step-by-step explanation:

sukhopar [10]2 years ago
4 0

Answer:

-4 , 3,3-9,12

Step-by-step explanation:

im the goat

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A physicist examines 25 water samples for nitrate concentration. The mean nitrate concentration for the sample data is 0.165 cc/
xz_007 [3.2K]

Answer:

The 80% confidence interval for the the population mean nitrate concentration is (0.144, 0.186).

Critical value t=1.318

Step-by-step explanation:

We have to calculate a 80% confidence interval for the mean.

The population standard deviation is not known, so we have to estimate it from the sample standard deviation and use a t-students distribution to calculate the critical value.

The sample mean is M=0.165.

The sample size is N=25.

When σ is not known, s divided by the square root of N is used as an estimate of σM:

s_M=\dfrac{s}{\sqrt{N}}=\dfrac{0.078}{\sqrt{25}}=\dfrac{0.078}{5}=0.016

The degrees of freedom for this sample size are:

df=n-1=25-1=24

The t-value for a 80% confidence interval and 24 degrees of freedom is t=1.318.

The margin of error (MOE) can be calculated as:

MOE=t\cdot s_M=1.318 \cdot 0.016=0.021

Then, the lower and upper bounds of the confidence interval are:

LL=M-t \cdot s_M = 0.165-0.021=0.144\\\\UL=M+t \cdot s_M = 0.165+0.021=0.186

The 80% confidence interval for the population mean nitrate concentration is (0.144, 0.186).

6 0
3 years ago
Guided Practice
frez [133]

Answer:

A. 15, 20, and 25

Step-by-step explanation:

Note that 3-4-5 is a pythagorean triple via following:

\sqrt{ (3^2 + 4^2 )} = 5^2

Dividing 15, 20, and 25 by 5 nets you the pythagorean triple 3-4-5.

7 0
3 years ago
Read 2 more answers
If you know the perimeter of the square, you can find the area of the square in two steps. Describe the two steps.
Veronika [31]
1) Take the perimeter and divide it by 4.
2) Take the answer from step 1 and square it (multiply by itself)
6 0
3 years ago
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In 2008 Yolanda paid 4873 in social security tax. If the Social Security tax rate was 6.2% to the maximum income and 94,200 that
harina [27]

Answer:

IM A PLAYA FORGIVE ME LOLOL

8 0
3 years ago
Read 2 more answers
What is the percent of the discount for a $60 item that sells for $45?
goblinko [34]

Answer:

75%

Step-by-step explanation:

45/60 x X/100

45x100

4500/60

75%

4 0
3 years ago
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