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Ivan
3 years ago
15

To test the effectiveness of a new cold vaccine, a random sample of 50 people was selected. They were divided in two groups: one

consisted of 30 people who received the vaccine, and the other who did not receive the vaccine .What can we conclude about the effectiveness of this new cold vaccine (at a 5% level of significance) if in the first group 9 of the 30 who received the vaccine caught the cold, while in the other group 11 of the 20 people who did not receive the vaccine caught the cold.
Mathematics
1 answer:
Georgia [21]3 years ago
3 0

Step-by-step explanation:

Roll no irjdhrjejdjdjdndndnndbdnd dbdnsndnd

dnsnsnsjsnnzjznzjs

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A complex number z=a+bi had an absolute value of 3.28. What could the values of a and b be ? A.a=1.5,b=1.7 C.a=1.7,b=2.8
Levart [38]
The given complex number is ⇒ z = a + b i
The absolute value of z = √( a² + b² ) = 3.28
So, we will check which of the options will give 3.28

<span>( A) IF ⇒⇒ a=1.5 and b=1.7
</span>
<span>∴ √( a² + b² ) = √( 1.5² + 1.7²) = √5.14 ≈ 2.27
</span>
===================================

<span>(B) IF ⇒⇒ a=1.5 and b=3.3
</span>
<span>∴ √( a² + b² ) = √(1.5² + 3.3²) = √13.14 ≈ 3.62
</span>
====================================

<span>(C) IF ⇒⇒ a=1.7 and b=2.8
</span>
<span>∴ √( a² + b² ) = √(1.7² + 2.8²) = √10.73 ≈ 3.28
</span>
====================================

<span>(D) IF ⇒⇒ a=2.8 and b=3.3
</span>
∴ √( a² + b² ) = √(2.8² + 3.3²) = √18.73 ≈ 4.33
=====================================
So, the correct answer is option (C) <span>a=1.7,b=2.8</span>
4 0
3 years ago
What is 37 years converted into hours?
natta225 [31]
There are 24 hrs in a day, and there are 365 days in an year

first step: multiply years with days

37 x 365 = 13505 days in all

second step: multiply days with hrs

13505 x 24 = 324120 hrs

your total is 324120 hrs

hope this helps
6 0
3 years ago
Read 2 more answers
Need help plz i show me how to do it plz :)
DaniilM [7]
I’m pretty sure you multiply the sides your you find the formulas for the hight and width
8 0
3 years ago
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(a) Christine received 70 dollars.<br> Write a signed number to represent this change.
allochka39001 [22]
70 or +70
To represent a positive integer
8 0
3 years ago
Pls help ple help pls help
stich3 [128]
P-24=15

because if argentina has 15 more than south africa then you need to subtract 24-15=p which is pretty much the same things as p-24=15

and if you need to know how many provinces south africa has then 9 provinces should be your answer
3 0
3 years ago
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