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
gladu [14]
3 years ago
11

Steroids, which are dangerous, are sometimes used to improve athletic performance. A study by the National Athletic Trainers Ass

ociation surveyed random samples of 1679 high school freshmen and 1366 high school seniors in Illinois. Results showed that 34 of the freshmen and 24 of the seniors had used anabolic steroids. Estimate at a 95% confidence level the difference between the proportion of freshmen using steroids in Illinois and the proportion of seniors using steroids in Illinois.
Mathematics
1 answer:
Yanka [14]3 years ago
7 0

Answer:

At 95% confidence level, the difference between the proportion of freshmen using steroids in Illinois and the proportion of seniors using steroids in Illinois is -7.01135×10⁻³ < \hat{p}_1-\hat{p}_2 < 1.237

Step-by-step explanation:

Here we are required to construct the 95% confidence interval of the difference between two proportions

The formula for the confidence interval of the difference between two proportions is as follows;

\hat{p}_1-\hat{p}_2\pm z^{*}\sqrt{\frac{\hat{p}_1\left (1-\hat{p}_1  \right )}{n_{1}}+\frac{\hat{p}_2\left (1-\hat{p}_2  \right )}{n_{2}}}

Where:

\hat{p}_1  = \frac{34}{1679}

\hat{p}_2 = \frac{24}{1366}

n₁ = 1679

n₂ = 1366

z_{\alpha /2} at 95% confidence level = 1.96

Plugging in the values, we have;

\frac{34}{1679}- \frac{24}{1366} \pm 1.96 \times \sqrt{\frac{ \frac{34}{1679}\left (1- \frac{34}{1679}\right )}{1679}+\frac{\frac{24}{1366} \left (1-\frac{24}{1366}   \right )}{1366}}

Which gives;

-7.01135×10⁻³ < \hat{p}_1-\hat{p}_2 < 1.237.

At 95% confidence level, the difference between the proportion of freshmen using steroids in Illinois and the proportion of seniors using steroids in Illinois = -7.01135×10⁻³ < \hat{p}_1-\hat{p}_2 < 1.237.

You might be interested in
Math question help me please
nignag [31]

Answer:

he 8 times

Step-by-step explanation:

so he mows 5 time his sister which is 9 but it says 3 for the sister instead of 4 making it 8

3 0
3 years ago
The slope of a given line is shown below. Find the slope of a line parallel to the given line and the slope of a line perpendicu
Sphinxa [80]

Answer:

The slope of a line parallel to the given line = 5

The slope of a line perpendicular to the given line = - 1/5

Step-by-step explanation:

6 0
3 years ago
How do i simplify -9x^3+8x^2-(7x/6)-(-7)
cricket20 [7]
Multiply -1 by -7
-9x^3 + 8x^2 - 7x/6 + 7
7 0
3 years ago
A line passes through the point (8,-2) and has a slope of -5/2. Write an equation in slope intercept form
sergij07 [2.7K]

Answer:

abcd

Step-by-step explanation:

3 0
3 years ago
The ratio of girls to boys in grade 6 was 3:2 at Lincoln middle school last year. There were 60 kids in grade 6. How many in gra
olasank [31]

Answer:

40 girls 20 boys i think / guess

Step-by-step explanation:

3 0
2 years ago
Other questions:
  • What figure must have four right angles
    9·2 answers
  • Answer this |2x-9|&lt;8
    5·2 answers
  • What is the value of x? enter in the box.​
    15·2 answers
  • Simplify the expression 38 x 34.​
    6·2 answers
  • -7 1/3 divided by 4 1/4 in mixed number.
    10·1 answer
  • Solve for x: 5x – 2 = 13<br> GIVING BRAINLIST!! Please help
    9·2 answers
  • How to use the quadratic formula on a graphing calculator
    8·1 answer
  • A plumber needs to drill a hole that is just slightly larger than 3/16 of an inch in diameter. Which measurement is the smallest
    10·1 answer
  • Nipa exercises for 225 minutes a week. How many hours does she exercise in a year?
    15·1 answer
  • Olga buys 54 stickers. The stickers are arranged on 6 sheets, with the same number of stickers on each sheet. Which equation and
    6·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!