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Mariana [72]
3 years ago
10

Two catalysts in a batch chemical process, are being compared for their effect on the output of the process reaction. A sample o

f 12 batches was prepared using catalyst 1, and a sample of 10 batches was prepared using catalyst 2. The 12 batches for which catalyst 1 was used in the reaction gave an average yield of 85 with a sample standard deviation of 4, and the 10 batches for which catalyst 2 was used gave an average yield of 81 and a sample standard deviation of 5. Find a 90% confidence interval for the difference between the population means, assuming that the populations are approximately normally distributed with equal variances.

Mathematics
1 answer:
anzhelika [568]3 years ago
3 0

Answer:

2.083 < µ1 - µ2 < 5.917  

Step-by-step explanation:

We will need to construct a 90% confidence interval for the difference of 2 means where the populations are normally distributed, and their variances are equal.

The calculations of the sample means and standard deviations are done for us.

Sample 1: Catalyst 1

n = 12, x = 85, s = 4

Sample 2:  Catalyst 2

n = 10, x = 81, s = 5

See attached photo for the construction of the confidence interval...

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What is the y coordinate in the solution for the system of linear equations below
Natali5045456 [20]

Answer:

y=6

Step-by-step explanation:

use elimination by making the ys opposite in value and eliminating them from the equation so there is only variable:

-3x+2y=6

2(4x-y=2)

-3x+2y=6

8x-2y=4

Combine like terms and divide by 5 on both sides.

5x=10

x=2

Plug x in to find y:

4(2)-y=2

8-y=2

y=6

5 0
3 years ago
I need some help on the question below please, and thank you.
White raven [17]
It might be 31 if you add all the numbers together but I'm not positive.
6 0
3 years ago
69 points!!!!!!!!!!!! ANYONE who can answer this please
Sloan [31]
I would either graph these (which would be a easiest) then you would see a line that goes through (0, -2) on the y-axis
And you can either determine the slope from the graph or pick two points above and find the slope.




or spread them out evenly and fill out the missing pieces.

-8. -4



-4. -3



0



4. -1

6. -0.5

8



12. 1


Fill in the middle values and you can put (6,-0.5) on there

What pattern do u see? This way would be pretty hard.


Equation: y=(1/4)x-2
8 0
3 years ago
Read 2 more answers
8:10 = 2:5<br> Is a true proportion?<br><br> O Yes<br> O No
Marina86 [1]

Answer:

Step-by-step explanation:

it is not.

7 0
3 years ago
Read 2 more answers
Weight: How many grams does a 5 lb 15 oz roast weigh?The roast weighsgrams.
natulia [17]

Since 1kg = 2.20 lb,

\frac{1\operatorname{kg}}{2.20\text{ lb}}

Since 1kg = 1000g

\frac{1000\text{ g}}{1\operatorname{kg}}

So for covering pounds to gram by the following factor

\frac{1\operatorname{kg}}{2.20\text{ lb}}\frac{1000\text{ g}}{1\operatorname{kg}}

Since 1oz = 28.3g

\frac{28.3\text{ g}}{1\text{ oz}}

Now

5\text{ lb}\frac{1000\text{ g}}{2.20\text{ lb}}+15\text{ oz}\frac{28.3g}{1\text{ oz}}

The weight in grams would be

2697.22 gr

5 0
1 year ago
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