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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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Hello I might seem but what is (r35) + x -89+(r34)
notka56 [123]

Answer:

Step-by-step explanation:

56

4 0
2 years ago
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Ahmed an Art dealer earns 25% commission of the dollar value of the art pieces that he sells at the Gallery. Ahmed earns $10,000
Mkey [24]

Answer:

$40,000

Step-by-step explanation:

25% of x = $10,000

0.25x = 10,000

x = 10,000/0.25

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Answer: $40,000

3 0
3 years ago
I need help ASAP!!!!!!!!!!!!!
Ede4ka [16]
The first question is 50% because a total of 30 girls bought lunches out of 60 kids

the second question, the easiest way is to plug in the x and y coordinates
3(4) - 2(0) = 12
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3 years ago
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Please help with math question! This question is stressing me out (View Image)
TEA [102]
To find the volume of this one we need to break it down 
now i see half of a cylinder and rectangle:)
but first lets find the volume of the rectangle...
In order to find the Volume of a rectangle we need to use this formula...
Length x width x height 
in this case...
length = 10in
width = 6 in 
height = 8in
lets solve:)
10 x 6 x 8 = 480
or we write it like this 
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now time to find the volume of the half cylinder:)
But first lets remember the volume for a cylinder
Volume = \pi r^{2} h
So lets find our measurements 
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r² = 5² or 25
h = 6 
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3.14 x 25 x 6 
now lets easily solve 
<span>3.14 x 25 x 6 = 471
</span>now since we found an entire cylinder and we only want half of a cylinder lets divide our answer in half
471 ÷ 2 = 235.5
so we write it like this 235.5units³
But we have to add both of our multiples together so lets do that
Volume of rectangle = <span>480in³
</span>volume of half sphere = 235.5units³
480 + 235.5 = 715.5
answer = 715.5units³
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MARK ME BRAINLIEST! :D
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3 years ago
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Sveta_85 [38]
5.7 is 5 7/10 and it cannot be simplified
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3 years ago
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