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
Anestetic [448]
3 years ago
8

A physical therapist wants to determine the difference in the proportion of men and women who participate in regular sustained p

hysical activity. What sample size should be obtained if she wishes the estimate to be within two percentage points with 99​% ​confidence, assuming that ​(a) she uses the estimates of 21.2​% male and 19.7​% female from a previous​ year? ​(b) she does not use any prior​ estimates?
Mathematics
1 answer:
Oliga [24]3 years ago
7 0

Answer:

no of sample within two percentage points  is 5409

no of sample not use prior​ estimates is 8321

Step-by-step explanation:

Given data

E = 2% = 0.02

male m = 21.2 % = 0.212

female f = 19.7 % = 0.197

to find out

no of sample within two percentage points and if does not use any prior​ estimates

solution

first we calculate no of sample within two percentage points

we know Z critical value for 99% is 2.58

so no of sample will be

n = (Z / E )² × m(1-m) + f ( 1-f )

put all the value we get no of sample

n = (2.58 / 0.02 )² × 0.212 ( 1 - 0.212 ) + 0.197 ( 1 - 0.197 )

n =  16641 ×0.3250

no of sample within two percentage points  is 5409

in 2nd part no of sample not use prior​ estimates

here than f and m will be 0.5

than

n = (Z / E )² × m(1-m) + f ( 1-f )

put all value

n = (2.58 / 0.02 )² × 0.5 ( 1 - 0.5 ) + 0.5 ( 1 - 0.5 )

n =  16641 ×  0.5

no of sample not use prior​ estimates is 8321

You might be interested in
Show a step-by-step process of solving 7/20 and getting a decimal answer.
Luden [163]
First we have to multiply the numerator and the denominator by 5:
\frac{7}{20}* \frac{5}{5}= \frac{35}{100} = 0.35

5 0
3 years ago
OMG IM SO CONFUSED HELPPPP
Sunny_sXe [5.5K]

Answer:

5.4 is rational. 5.4 divide by 2 is 2.45 5.3 and 5 3 are irrational, as it cant be divided easily

8 0
3 years ago
. If there are 20 girls in a class of 30 students, find out the percentage of boys in the class?​
Katena32 [7]

Answer:

10

Step-by-step explanation:

because there are 20 girls and 10 boys = 30

4 0
2 years ago
Read 2 more answers
Name the decimal and fraction for R on the number line.
Hatshy [7]
Hrbdjrb283.3jdjrhehhdhrbd
5 0
2 years ago
Read 2 more answers
How are slope 1 and slope 2 related?
Diano4ka-milaya [45]
The answer is B. Adjacent angles. They both have a meeting point and don't overlap.
The answer isn't A. because both angles don't add up to 90°.
The answer isn't C. because both angles aren't 90°.
The answer isn't D. because both angles don't add up to 180°.

Hope this helps! :)

\(^ ◇^)/
6 0
3 years ago
Other questions:
  • Which correlation coefficient represents the strongest relationship between two variables?
    12·1 answer
  • A medical equipment industry manufactures X-ray machines. The unit cost C (the cost in dollars to make each X-ray machine) depen
    7·1 answer
  • The answer and I don't get it
    13·1 answer
  • According to Nasa, when the International Space Station (ISS) is at an altitude of 385 kilometers, it travels at about 17,178 mi
    12·1 answer
  • 7TH GRADE MATH !! pls help and I'll love you forever <33
    12·1 answer
  • Please advise, I need help with this equation
    8·1 answer
  • What will $82,000 grow to be in 11 years if it is invested today at 8% and the interest rate is compounded monthly? Answer: ​
    15·1 answer
  • Can someone please help me solve this? I will give brainist for the person who does it correctly.
    13·1 answer
  • Reflect the shape A in the line x=1
    14·1 answer
  • Hitung nilai x bagi persamaan <br>Calculate the value of x for the equation ​
    13·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!