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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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–2z − 7 need this done now
Debora [2.8K]

Answer:

the value of the z is -3.5

Step-by-step explanation:

According to the question, the following information is given

-2z - 7

Based on the above information

We assume that we have to determine the z value

so

-2z - 7 = 0

-2z = 7

z = 7 ÷ -2

= -3.5

Hence, the value of the z is -3.5

The same is to be considered and relevant too

5 0
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A square patio has an area of 200 ft.² how long is each side of the patio to the nearest 0.05
kicyunya [14]

Answer: Square root of 200= 14.14ft

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3 0
3 years ago
I need help please and thx you
NARA [144]

Answer:

1- 3/4

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3- 2/3

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Step-by-step explanation:

1= a

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4 0
3 years ago
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swat32

Answer:

1 is 28 as it is just asking the area (At least I think)

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Step-by-step explanation:

4x7 is 28 (For one)

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