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
Gemiola [76]
3 years ago
10

Researchers at the National Cancer Institute released the results of a study that investigated the effect of weed-killing herbic

ides on house pets. The randomly sampled 400 dogs from homes where an herbicide was used on a regular basis, diagnosing lymphoma in 230 of them. Of 200 dogs randomly sampled from homes where no herbicides were used, only 25 were found to have lymphoma. For this problem, let p1 be the population proportion of dogs that get lymphoma from homes where herbicides are used and p2 be the population proportion of dogs that get lymphoma from homes where herbicides are not used. Researchers are interested in learning about the difference in the proportion of cancer diagnoses between the two groups. What is the 95% confidence interval for the difference in the proportion of cancer diagnoses between the two groups
Mathematics
1 answer:
jolli1 [7]3 years ago
3 0

Answer:

The 95% confidence interval for the difference in the proportion of cancer diagnoses between the two groups is (0.3834, 0.5166).

Step-by-step explanation:

Before building the confidence interval, we need to understand the central limit theorem and subtraction between normal variables.

Central Limit Theorem

The Central Limit Theorem estabilishes that, for a normally distributed random variable X, with mean \mu and standard deviation \sigma, the sampling distribution of the sample means with size n can be approximated to a normal distribution with mean \mu and standard deviation s = \frac{\sigma}{\sqrt{n}}.

For a skewed variable, the Central Limit Theorem can also be applied, as long as n is at least 30.

For a proportion p in a sample of size n, the sampling distribution of the sample proportion will be approximately normal with mean \mu = p and standard deviation s = \sqrt{\frac{p(1-p)}{n}}

Subtraction between normal variables:

When two normal variables are subtracted, the mean is the difference of the means, while the standard deviation is the square root of the sum of the variances.

The randomly sampled 400 dogs from homes where an herbicide was used on a regular basis, diagnosing lymphoma in 230 of them.

This means that:

p_h = \frac{230}{400} = 0.575, s_h = \sqrt{\frac{0.575*0.425}{400}} = 0.0247

Of 200 dogs randomly sampled from homes where no herbicides were used, only 25 were found to have lymphoma.

This means that:

p_n = \frac{25}{200} = 0.125, s_n = \sqrt{\frac{0.125*0.875}{200}} = 0.0234

Distribution of the difference:

p = p_h - p_n = 0.575 - 0.125 = 0.45

s = \sqrt{s_h^2+s_n^2} = \sqrt{0.0247^2 + 0.0234^2} = 0.034

Confidence interval:

The confidence interval is:

p \pm zs

In which

z is the zscore that has a pvalue of 1 - \frac{\alpha}{2}.

95% confidence level

So \alpha = 0.05, z is the value of Z that has a pvalue of 1 - \frac{0.05}{2} = 0.975, so Z = 1.96.

The lower bound is 0.45 - 1.96(0.034) = 0.3834

The upper bound is 0.45 + 1.96(0.034) = 0.5166

The 95% confidence interval for the difference in the proportion of cancer diagnoses between the two groups is (0.3834, 0.5166).

You might be interested in
Simplify <br> 6 minus the square root of 25 over 4<br> I would appreciate some help :)
marshall27 [118]
6-5 (the square root of 25) is 1, so the answer is 1/4 or 0.25
8 0
3 years ago
(8x^2-6x-2)-(4x^2+6)
Anestetic [448]
The answer is 32x^4-24x^3+40x^2-36x-12
5 0
3 years ago
An item is on sale for $12.00. It originally was $16.50.
lbvjy [14]

Answer:

C

Step-by-step explanation:

Decreased price = 16.50 - 12 = $ 4.50

Percent of decrease =

=\frac{4.50}{16.50}*100\\\\= 27.27

= 27%

7 0
3 years ago
Read 2 more answers
scenario a: get $2,000 deposited into your bank account today, and $50 added each month for a year? make a f(×) function pls​
Dennis_Churaev [7]
Mathematics I hate mathematics
7 0
2 years ago
Complete the table.
Sauron [17]

Answer:

40

60

Step-by-step explanation:

20÷2=10

10×4=40

10×6=60

3 0
3 years ago
Read 2 more answers
Other questions:
  • Lindsay drove for 5 1 /2 hours at 60 miles per hour. How much distance did she travel?
    11·1 answer
  • Solve the equation.<br><br> x2 − 6x − 7 = 0
    12·1 answer
  • You invest $75/ quarter at a rate of 4.00% APR compounded monthly for 30 years.
    11·1 answer
  • Which pairs of angles in the figure below are vertical angles?<br>Check all that apply.<br>​
    8·2 answers
  • Plz help this is due soon​
    11·1 answer
  • Evaluate the expression w^2 - v + 1 for w = -2 and v = -8.<br> -3<br> -11<br> 13<br> 5
    9·1 answer
  • Find the product.<br> 3(m + n)<br> 3m + 3n<br> 3mn<br> 3m-n
    9·1 answer
  • Which shows two possible values for a number represented by the point?
    11·1 answer
  • Can y’all help me on these plzz I’ll mark Brainly!!!!!!!
    5·2 answers
  • Can someone please help me pleaseeee!
    15·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!