1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
valentina_108 [34]
2 years ago
13

A random sample of 146 recent donations at a certain blood bank reveals that 81 were type A blood. Does this suggest that the ac

tual percentage of type A donations differs from 40%, the percentage of the population having type A blood
Mathematics
1 answer:
Tju [1.3M]2 years ago
6 0

Answer:

We reject H₀  the actual percentage of type A donations differs from 40%

Step-by-step explanation:

Sample information:

sample size   n = 146

Type A   x₁  =  81   and   p₁  = 81 / 146     p₁  =  0,5547

then  q₁   =  1 - p₁    q₁  =  1  -  0,5547    q₁  =  0,4453

We choose as significance level  α  = 5%  α = 0,05   α /2  = 0,025

from z-table we find   z (c) = 1,96

National % of the population  ( μ  = 40 %  μ = 0,4 )

Test hypothesis

Null hypothesis                           H₀           p₁  =  μ

Alternative Hypothesis              Hₐ           p₁   ≠ μ

The Alternative hypothesis indicates that the test is a two-tail test

z(s) =  ( p₁  -   μ )/ √ p₁*q₁ / n

z(s) =  ( 0,5547  -  0,40 )/ √ 0,5547*0,4453 / 146

z(s) =  0,1547 / 0,041

z(s) = 3,77

Comparing  z(s)  and z(c)

z(s) > z(c)  

z(s) is in the rejection region. We reject H₀. Sample does not give evidence to support that the actual percentage of type A donations is equal to the national population

You might be interested in
Solve for n. 2n − 35=5
Elena-2011 [213]

Answer:

n = 20

Step-by-step explanation:

2n − 35 = 5

find: n

2n = 5 + 35

n = 40 / 2

n = 20

8 0
3 years ago
Read 2 more answers
Simplifying the following<br>expression<br>6 + 2(3-9 + 5) + (- 9)​
Verizon [17]

Answer:

-5

Step-by-step explanation:

First, distribute the 2 to the 3, -9, and 5. You will get 6 + 6 - 18 + 10 + (-9). Then, you can start from the beginning and work through combining the terms. The original equation is in bold after every step.

6 + 6 - 18 + 10 + (-9)

6+6 = 12

12 - 18 + 10 + (-9)

12-18 = -6

- 6 + 10 + (-9)

-6 + 10 = 4

4 + (-9)

4 - 9 = -5

Answer: -5

6 0
3 years ago
Given a point A(-2,5), find the coordinates of a point B so that the line segment AB has each slope.
Kaylis [27]

Step-by-step explanation:

I understand this that we need to find a point B for each of a) to f).

remember, the slope is the (y coordinate difference / x coordinate difference) when going from one point on the line to the other.

a)

the slope 2/3 means that when going to B x has to increase by 3, and y has to increase by 2.

so, B = (-2 + 3, 5 + 2) = (1, 7)

b)

-2/3 means that either x or y have to decrease and the other to increase.

e.g. x increases by 3, y decreases by 2.

so, B = (-2 + 3, 5 - 2) = (1, 3)

c)

4 stands for 4/1.

so, x increases by 1, y increases by 4.

B = (-2 + 1, 5 + 4) = (-1, 9)

d)

similar to c) -3 stands for -3/1.

and similar to b) either x or y has to decrease and the other to increase.

e.g. x increases by 1, y decreases by 3.

B = (-2 + 1, 5 - 3) = (-1, 2)

e)

that means the y difference is 0. B has the same y coordinate.

e.g. B = (3, 5)

x can be any value.

the line is a horizontal line going through y = 5 or (0, 5) on the y-axis.

f)

that means the x difference is 0. B has the same x coordinate.

e.g. B = (-2, 9)

y can be any value.

the line is a vertical line going through x = -2 or (-2, 0) on the x-axis.

8 0
10 months ago
Factor trinomial x^2n+10x^n+16​
iragen [17]

Answer:

\large\boxed{x^{2n}+10x^n+16=(x^n+2)(x^n+8)}

Step-by-step explanation:

\text{Use}\ (a^n)^m=a^{nm}.\\\\x^{2n}+10x^n+16=(x^n)^2+10x^n+16=x^n\cdot x^n+2x^n+8x^n+16\\\\=x^n(x^n+2)+8(x^n+2)=(x^n+2)(x^n+8)

8 0
2 years ago
Simplify the expression. Show your work. 22 + (32 – 4 2 )
Alex Ar [27]
You have to use PEMDAS:

Parentheses
Exponents
Multiplication
Division
Addition
Subtraction

First, do parentheses.

32 - 42 = -10

22 + -10 = 12

Answer = 12

Hope this helped
Have a great day :)


8 0
2 years ago
Other questions:
  • Soling two step inequalities<br> d=5v+m, solve for v
    6·1 answer
  • What is the value of x?
    15·1 answer
  • Evaluate
    5·1 answer
  • Can you take 7 from 8
    8·2 answers
  • What is 3 5/14 as an improper fraction
    8·1 answer
  • What is seven point five divided by one hundred
    6·1 answer
  • Find the length of the segment with endpoints of (3,2) and (-3,-6).
    5·1 answer
  • ok yall i need help and yall kinda no treading the question fully READ ITTTTT, i will give brainleist
    14·2 answers
  • What is the probability of the next elk caught in the park being unmarked? Write the probability as a fraction, a decimal number
    12·2 answers
  • how many 3 digit positive numbers have their hundreds, tens, and units digits in strictly ascending order
    14·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!