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Helen [10]
3 years ago
13

Can anybody help me out thanks I'm having trouble

Mathematics
2 answers:
Lana71 [14]3 years ago
7 0

Answer:

b

Step-by-step explanation:

Snowcat [4.5K]3 years ago
3 0

Answer:

b

Step-by-step explanation:

theres a test that was like this one that i tookk

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Here are summary statistics for randomly selected weights of newborn​ girls: nequals202​, x overbarequals28.3 ​hg, sequals6.1 hg
Lorico [155]

Answer:

The confidence interval is 27.5 hg less than mu less than 29.1 hg

(A) Yes, because the confidence interval limits are not similar.

Step-by-step explanation:

Confidence interval is given as mean +/- margin of error (E)

mean = 28.3 hg

sd = 6.1 hg

n = 202

degree of freedom = n-1 = 202-1 = 201

confidence level (C) = 95% = 0.95

significance level = 1 - C = 1 - 0.95 = 0.05 = 5%

critical value corresponding to 201 degrees of freedom and 5% significance level is 1.97196

E = t×sd/√n = 1.97196×6.1/√202 = 0.8 hg

Lower limit = mean - E = 28.3 0.8 = 27.5 hg

Upper limit = mean + E = 28.3 + 0.8 = 29.1 hg

95% confidence interval is (27.5, 29.1)

When mean is 28.3, sd = 6.1 and n = 202, the confidence limits are 27.5 and 29.1 which is different from 27.8 and 29.6 which are the confidence limits when mean is 28.7, sd = 1.8 and n = 17

7 0
3 years ago
Simplify: <br> −(−3)2(5)2(7)3<br> 152<br><br> A) -343 <br> B) -127 <br> C) -75 <br> D) 126
Lilit [14]

Answer:

If I read your problem write:  126

Step-by-step explanation:

if I interpret this as

- (-3)* 2 * (5) * 2 * (7) * 3  divided by 5 * 2

we can get  126

because:

- (-3)* 2 * (5) * 2 * (7) * 3  divided by 5 * 2

= 6 * 5 * 2 *7 * 3 / (5*2)

= 60*7 * 3/ (5*2)

= 420 * 3 / 10

= 1260/10

= 126

7 0
3 years ago
3/8 + (-7/8)=<br> Write the answer in simplest form
ludmilkaskok [199]

Answer:

(3 ÷ 8) + (-7 ÷ 8)

0.375 + -0.875  

        -0.5

Hope this helps !

5 0
3 years ago
if the area of a circle is represented by A=21π, what is the radius of the circle? round your answer to the nearest tenth
Reptile [31]
The equation is actually
circle area = PI * radius^2
radius = square root (area / PI)


5 0
3 years ago
To convert degrees Fahrenheit (F) into degrees Celsius (C) use the formula 2003-05-04-00-00_files/i0150000.jpg. Rewrite the equa
bulgar [2K]
Here's the formula for both conversions:

5 0
3 years ago
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