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
Aleks04 [339]
3 years ago
11

It has been observed that some persons who suffer acute heartburn, again suffer acute heartburn within one year of the first epi

sode. This is due, in part, to damage from the first episode. The performance of a new drug designed to prevent a second episode is to be tested for its effectiveness in preventing a second episode. In order to do this two groups of people suffering a first episode are selected. There are 55 people in the first group and this group will be administered the new drug. There are 45 people in the second group and this group will be administered a placebo. After one year, 11% of the first group has a second episode and 9% of the second group has a second episode. Conduct a hypothesis test to determine, at the significance level 0.1, whether there is reason to believe that the true percentage of those in the first group who suffer a second episode is different from the true percentage of those in the second group who suffer a second episode?
Mathematics
1 answer:
-Dominant- [34]3 years ago
6 0

Answer:

Null hypothesis :

H_o:p_1-p_2 = 0

Alternative hypothesis:

H_1:p_1-p_2 \neq 0

Decision Rule:

To reject the null hypothesis if  z < -1.65 and z > 1.65

Conclusion:

Failed to reject null hypothesis if z > -1.65 or z < 1.65

z -value = 0.33022

P-value = 0.7414

Decision Rule:

Since the P-value is higher than the level of significance , therefore do not reject the null hypothesis at the level of significance of 0.1

Conclusion:  we failed to reject null hypothesis, Therefore, the data does not believe that the true percentage of those in the first group who suffer a second episode is different from the true percentage of those in the second group who suffer a second episode

Step-by-step explanation:

From the summary of the given statistical data sets.

Let consider to p_1 represent percentage of the first group ; &

p_2 represent percentage of the second group

The null and the alternative hypothesis can be stated s follows:

Null hypothesis :

H_o:p_1-p_2 = 0

Alternative hypothesis:

H_1:p_1-p_2 \neq 0

At the level of significance ∝ = 0.1; the two tailed critical value from the z-table

z_{\alpha/2} = 1.65

Decision Rule:

To reject the null hypothesis if  z < -1.65 and z > 1.65

Conclusion:

Failed to reject null hypothesis if z > -1.65 or z < 1.65

However; from the question:

There are 55 people in the first group and this group will be administered the new drug.

There are 45 people in the second group and this group will be administered a placebo.

After one year, 11% of the first group has a second episode and 9% of the second group has a second episode.

The test statistic for the for the first group who suffered from the second episode can be denoted as :

\hat p_1 = \dfrac{\overline x_1}{n_1}=0.11

The test statistic for the for the second group who suffered from the second episode can be denoted as :

\hat p_2 = \dfrac{\overline x_2}{n_2}=0.09

where;

n_1 = sample size of group 1 = 55

n_2 = sample size of group 2 = 45

The total probability of both group is :

\hat p = \dfrac{n_1 \hat p_1 + n_2 \hat p_2}{n_1 + n_2}

\hat p = \dfrac{55*0.11+ 45 * 0.09}{55+45}

\hat p = \dfrac{6.05+ 4.05}{100}

\hat p = \dfrac{10.1}{100}

\hat p = 0.101

The standard error of the statistic \hat p_1 - \hat p_2 an be computed as follows:

S.E(\hat p_1 - \hat p_2)= \sqrt{ p_1 (1 - \hat p)( \dfrac{1}{n_1}+\dfrac{1}{n_2})}

S.E(\hat p_1 - \hat p_2)= \sqrt{0.101 (1 - 0.101)( \dfrac{1}{55}+\dfrac{1}{45})}

S.E(\hat p_1 - \hat p_2)= \sqrt{0.101(0.899)(0.0404)}

S.E(\hat p_1 - \hat p_2)= \sqrt{0.0036682796}

S.E(\hat p_1 - \hat p_2)=0.060566

Now; The test statistics is determined to be :

z = \dfrac{(\hat p_1 - \hat p_2 ) - (p_1-p_2)}{SE(\hat p_1 - \hat p_2)}

z = \dfrac{(0.11-0.09) - 0}{0.060566}

z = 0.33022

Hence; the value for the test statistics =  0.33022

the value for the test statistics =  0.33

From the z value; The P-value for the test statistics can be computed as:

P-value = 2P(Z ≥ |z|)

P-value = 2P(Z ≥  0.33022)

P-value = 2 × P (Z ≤ - 0.33022)

From the z table Z ≤ - 0.33022 = 0.3707

P-value = 2 × 0.3707

P-value = 0.7414

Decision Rule:

Since the P-value is higher than the level of significance , therefore do not reject the null hypothesis at the level of significance of 0.1

Conclusion:  we failed to reject null hypothesis, Therefore, the data does not believe that the true percentage of those in the first group who suffer a second episode is different from the true percentage of those in the second group who suffer a second episode

You might be interested in
MARKING BRAINLIEST!!<br><br> For what value of x is the figure below a rectangle?
Vedmedyk [2.9K]
<h2><u><em>Answer: Yes it is a rectangle I don't know if that's all you want to know</em></u></h2>

<u><em></em></u>

5 0
2 years ago
Can someone explain this?
natulia [17]

Answer:

58 degrees

Step-by-step explanation:

(x+45)+(x+66)=95

2x+45+66=95

2x+111=95

2x=95-111

2x=-16

x=-16/2

x=-8

x+66=-8+66=58

8 0
3 years ago
Read 2 more answers
Does anyone know what lesson this is i took these notes are they good
Nezavi [6.7K]

Answer:

ngl i learned this type of math pretty sure, and that looks better than my teachers own notes-

Step-by-step explanation:

ima go poof again cuz if i don't ima lose my game ;-;

7 0
3 years ago
Read 2 more answers
I have 5 pinks, 4 yellow, 3 orange, and 3 red starbursts. What is the probability that I will randomly pick a yellow starburst,
Wittaler [7]
P(y)=4/15
P(r)= 3/14

(I’m assuming this is without replacement since you are the starburst, so there is one less of the total.)
7 0
3 years ago
If 5 people share 1/2 pound of trail mix how much would each person get ?
SSSSS [86.1K]
(1/2) / 5 = 1/2 * 1/5 = 1/10 of a lb
5 0
3 years ago
Read 2 more answers
Other questions:
  • Are all squares similar
    5·1 answer
  • A fisherman can row upstream at 4mph and downstream at 6mph. He started rowing upstream until he got tired and then started down
    12·3 answers
  • A liquid contains 0.25 mg of a substance per milliliter. How many grams of the substance will 3.5 L contain?
    8·1 answer
  • 1/9 of people in a class are left handed.
    11·1 answer
  • <img src="https://tex.z-dn.net/?f=2%20%20%7B%20%5Ctimes%20%7D%5E%7B2%7D%20%20-%204x%20-%202%20%3D%200" id="TexFormula1" title="2
    13·1 answer
  • Write the explicit formula for the geometric sequence below. 6,30,150,175
    5·1 answer
  • Help, this is confusing for me
    6·1 answer
  • There are 3 trucks for every 4 cars in a parking lot. How many trucks and cars could be in the parking lot?
    13·2 answers
  • Josiah had 48 slices of pie to share each of Josiah pies was cut into 8 slices how many pies did he have explain how you solved
    11·2 answers
  • The table below shows the linear relationship between the number of people at a picnic and the total cost of the picnic.
    12·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!