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Romashka-Z-Leto [24]
3 years ago
15

Here are summary statistics for randomly selected weights of newborn​ girls: n=250​, x_=32.9 ​hg, s=6.9 hg. Construct a confiden

ce interval estimate of the mean. Use a ​95% confidence level. Are these results very different from the confidence interval 31.9 hg < μ < 34.5 hg with only 19 sample​ values, x_ = 33.2​hg, and s = 2.9 ​hg?
Mathematics
1 answer:
butalik [34]3 years ago
6 0

Answer:

Step-by-step explanation:

Here are summary statistics for randomly selected weights of newborn​ girls: n=250​, x_=32.9 ​hg, s=6.9 hg. Construct a confidence interval estimate of the mean. Use a ​95% confidence level.

The confidence interval of mean

=32.9 ± 1.96 × 6.9/250

Confidence Interval = 32.9 ± 0.5382

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The population of Greater Accra increased by 20% and became 900,7000. The original population of the city was:
allochka39001 [22]

Answer:

the original population of the city is 7,505,833

Step-by-step explanation:

Given;

new of the population of the city, Y = 9,007,000

the percentage increase of the city, = 20% = 0.2

Let the original population of the city = X

New population, Y = X  + 0.2X

                           Y = X(1 + 0.2)

                           Y = X(1.2)

                           Y = 1.2X

                           X = Y/1.2

                           X = (9,007,000) / 1.2

                           X = 7,505,833

Therefore the original population of the city is 7,505,833

3 0
3 years ago
3 true conjectures that students may make concerning even and odd numbers
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Even numbers are easier to cope with in math problems

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6 0
3 years ago
-2 (2x + 11) = 5x + 14
amid [387]

Answer:

x=-4

Step-by-step explanation:

First, write the expression and distribute.

-2(2x+11)=5x+14

-4x-22=5x+14

Add one of the variables to the other side (it makes solving a lot easier). I'll add 4x to both sides because it won't result in a negative x.

-4x-22=5x+14

<u>+4x      +4x</u>

-22=9x+14

Now, subtract 14 on both sides.

-22=9x+14

<u>-14        -14</u>

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Divide both sides by 9.

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<u>/9   /9</u>

-4=x  or  x=-4 (they both mean the same thing)

Have a wonderful day! I hope this helped :3

3 0
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Misha Larkins [42]

Answer:

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5 0
3 years ago
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Lapatulllka [165]

Answer:

A

Step-by-step explanation:

8.5% of 81.42

8.5                 81.42           692.07

-------    X       ---------- =     -------------

100                     1                 100

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if you round it to the nearest hundredth you get 6.92

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