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OverLord2011 [107]
3 years ago
13

You are interested in determining which of two brands of light bulbs, brand A and brand B, lasts longer under differing conditio

ns of use. Fifty Bovano lamps are fitted with brand A light bulbs and 50 Bulbrite lamps are fitted with brand B light bulbs. Each light bulb is left on for 20,000 hours straight. Light bulb life is then measured for each bulb, and the average light bulb life for the two brands is compared. What is wrong with this experimental design?
Nothing is wrong with this design.
The type of lamp is a confounding variable.
Not enough light bulbs of each type are used in the study.
The experiment should have been conducted on more than two brands of lamps.
Mathematics
2 answers:
bulgar [2K]3 years ago
7 0

Answer:

The type of lamp is a confounding variable.

Step-by-step explanation:

to test the average life of the bulbs the same lamps should be used

Fofino [41]3 years ago
5 0

Answer:

The answer would be A. 1 1/5

Hope this helps!!!

Step-by-step explanation:

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10.3<br> Problem Solving<br> 33/5 as a whole number
goblinko [34]

Answer:

6 and 3/5

Step-by-step explanation:

5 0
3 years ago
Read 2 more answers
Solve 7x − 2(x + 1) = 6x + 14. (5 points)<br><br> −12<br><br> 12<br><br> −16<br><br> 16
anygoal [31]

Answer:

C

X=-16

Step-by-step explanation:

5 0
3 years ago
What is the probability that it will be blue?
anastassius [24]
Since its out of 15 marbles all together and all you need to find is the probability of 3 blue marbles you would have to divide 3 by 15. The outcome would be 0.2 or in your case... B. - 0.20
4 0
3 years ago
Pretty please help
beks73 [17]

how many solutions do intersecting lines have? - 0,1 or infinitely many

how many solutions do parallel lines have? - 0 or infinitely many

if you are looking at a graph and trying to find a solution what are you looking for? - for the point(s) when the graphs intersect

7 0
3 years ago
I need some help on number 15 please...
kondaur [170]
To solve this problem, all you need to do is make a standard graphing equation. The first step is finding mode using two points from the table. We'll use (1, 70) and (2, 90).
\frac{y_{1}- y_{2}  }{ x_{1}- x_{2}}  \\  \frac{70-90}{1-2}  \\  \frac{-20}{-1}  \\ 20
From the work, we've found that the slope of this equation is 20.

Next, we need to finish writing the equation and plug in the coordinates to solve for the y-intercept.
y=20x+b \\ 90=20(2)+b \\ 90=40+b  \\ (90)-40=(40+b)-40 \\ b=90-40  \\ b=50

Now we have all the information we need to write our equation, which is:
y = 20x+50

Hope this helps!

3 0
3 years ago
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