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AVprozaik [17]
3 years ago
8

Researchers doing a study comparing time spent on social media and time spent on studying randomly sampled 200 students at a maj

or university. They found that students in the sample spent an average of 2.3 hours per day on social media and an average of 1.8 hours per day on studying. If all the students at the university in fact spent 2.2 hours per day on studying, with a standard deviation of 2 hours, and we find the probability of observing a sample mean of 1.8 hours studying has an extremely low probability, we say that observed time is: statistically wrong. statistically unlikely. statistically significant. statistically rare.
Mathematics
1 answer:
larisa [96]3 years ago
5 0
Dachshund know what is this man what do frog is making
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A melting spherical block of ice has its surface area changing at the rate of 24 inch2 /sec at the time the radius is 3 inches.
emmainna [20.7K]
The surface area of the sphere is:
 A = 4 * pi * r ^ 2
 Deriving we have:
 A '= 8 * pi * r * r'
 We clear the speed:
 r '= A' / (8 * pi * r)
 Substituting values:
 r '= 24 / (8 * pi * 3)
 r '= 1 / pi inch / sec
 Then, the volume of the sphere is:
 V = (4/3) * (pi) * (r ^ 3)
 Deriving we have:
 V '= (3) * (4/3) * (pi) * (r ^ 2) * (r')
 Substituting values:
 V '= (3) * (4/3) * (pi) * (3 ^ 2) * (1 / pi)
 Rewriting:
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 Answer:
 
the volume of the ice is changing at 36 inch3 / sec at that moment
4 0
3 years ago
Find the area of the figure
maria [59]

Step-by-step explanation:

Area =0.5×base×height

Area= 0.5×5×3=7.5ft

5 0
2 years ago
Your father earned​ $34,000 per year in 1984. To the nearest​ dollar, what is that equivalent to in 2014 if the CPI in 2014 is 2
xeze [42]

Answer:

The answer is : 70288.46

Step-by-step explanation:

Your father earned​ $34,000 per year in 1984.

The CPI in 2014 is 215 and the CPI in 1984 is​ 104.

The CPI or consumer price index examines the weighted average of prices of goods and services like transportation, food etc.

The Current income equivalent will be = value in 1984 X ( CPI in 2014/CPI in 1984)

34000\times\frac{215}{104} = 70288.46

5 0
3 years ago
Can someone help :0 not sure how to solve but I'm doing algebra if that helps
Rus_ich [418]

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Step-by-step explanation:

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8 0
3 years ago
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Aleks [24]

Answer:

true

Step-by-step explanation:

8 0
2 years ago
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