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olya-2409 [2.1K]
2 years ago
13

A new actuarial test (Test A) was developed as a possible replacement for an old actuarial test (Test B). An actuary claimed tha

t the mean time to complete the new test A was more than the mean time to complete an old test B. The summary data for completion time (in minutes) are as follows.
Test A : n=9, X bar=160 minutes, S2=180 minutes
Test B : n=10 X bar=150 minutes, S2=30 minutes

a.At α=10%, use the Classical approach to test the actuary’s claim.
b.Using the P-value approach to conclude it.
Mathematics
1 answer:
alisha [4.7K]2 years ago
4 0
Test A is the answer
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Hey what's the answer ?<br><img src="https://tex.z-dn.net/?f=%28%20%7By%7D%5E%7B2%7D%20%20%2B%20%20%5Cfrac%7B5%7D%7B7%7D%20%29%2
3241004551 [841]

Answer: y^4 + \frac{-73}{35}y^2- 2

Step-by-step explanation:

Use FOIL:

y^4 + \frac{-14}{5}y^2 + \frac{5}{7}y^2 + \frac{-70}{35}

Make  \frac{-14}{5}y^2 and \frac{5}{7}y^2 have the same numerator:

\frac{-14*7}{5*7}y^2 =\frac{-98}{35}y^2

\frac{5*5}{7*5} y^2=\frac{25}{35} y^2

Then add like terms and simplify:

y^4 + \frac{-98}{35}y^2 + \frac{25}{35} y^2 + \frac{-70}{35}

y^4 + \frac{-73}{35}y^2- 2

7 0
3 years ago
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(b) Write the ratio 12:30 in the form 1:n
kari74 [83]

answer:

1 : 2.5

explanation:

given ratio: 12 : 30

divide by 12:

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n = 2.5

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2 years ago
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What is the circumference of the circle? (use 3.14 for pi)<br> r = 50mm
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Answer:

Step-by-step explanation:

circumference = 2\pir

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3 years ago
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If each shirt needs eight buttons you find out what times (×) Eight equals (=) 80
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3 years ago
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I need help with math rlly bad
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Step-by-step explanation:

what's the question sweetie?

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3 years ago
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