SOMEONE HELP PLEASE! i’m stuck!! HELP IF YOU WANT THE BRAINIEST!!

A random sample of 144 recent donations at a certain blood bank reveals that 81 were type A blood. Does this suggest that the ac

Reptile [31]

Answer:

Null hypothesis: $p=0.4$

Alternative hypothesis: $p \neq 0.4$

$z=\frac{0.5625 -0.4}{\sqrt{\frac{0.4(1-0.4)}{144}}}=3.98$

$p_v =2*P(z>3.98)=0.0000689$

Since the p value is very low compared to the significance level we have enough evidence to reject the null hypothesis and we can conclude that the true percent of people with type A of blood is significantly different from 0.4 or 40%

Step-by-step explanation:

Information given

n=144 represent the random sample taken

X=81 represent the number of people with type A blood

$\hat p=\frac{81}{144}=0.5625$ estimated proportion of people with type A blood

$p_o=0.4$ is the value that we want to verify

$\alpha=0.01$ represent the significance level

z would represent the statistic

$p_v{/tex} represent the p value Hypothesis to testWe want to test if the percentage of the population having type A blood is different from 40%.: Null hypothesis:[tex]p=0.4$

Alternative hypothesis: $p \neq 0.4$

the statistic is given by:

$z=\frac{\hat p -p_o}{\sqrt{\frac{p_o (1-p_o)}{n}}}$ (1)

Replacing the info given we got:

$z=\frac{0.5625 -0.4}{\sqrt{\frac{0.4(1-0.4)}{144}}}=3.98$

Now we can calculate the p value with this probability taking in count the alternative hypothesis:

$p_v =2*P(z>3.98)=0.0000689$

Since the p value is very low compared to the significance level we have enough evidence to reject the null hypothesis and we can conclude that the true percent of people with type A of blood is significantly different from 0.4 or 40%

3 0

3 years ago

A new car is purchased for 17600 dollars. The value of the car depreciates at 11.75% per year. What will the value of the car be

Liula [17]

Answer:

The answer would be 4,450

Step-by-step explanation:

:)

6 0

2 years ago

Find the value of 83 - [59 - (22 - 18)]

Kipish [7]

Use order of operations (PEMDAS)
83-(59-(22-18))
83-(59-4)
83-55=28

Final answer: 28

8 0

3 years ago

Read 2 more answers

Evaluate 9-5+(48/2)x5x7+6

Radda [10]

Answer:850

Step-by-step explanation:

I hope it helps

8 0

2 years ago

Read 2 more answers

Need help solving this

Airida [17]

There would be 101.33 students the following year

<h3>Ratios </h3>

From the question, we are to determine the number of students for the following year

From the given information,

There are 3 PA's for 38 students

If the ratio stays the same and

There were 8 PA's the following year, the number of students would be x

x = (8 × 38) / 3

x = 304 / 3

x = 101.33 students

Hence, there would be 101.33 students the following year

Learn more on Ratios here: brainly.com/question/2914376

#SPJ1

4 0

2 years ago