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
Reika [66]
3 years ago
9

Yi is running for class president. To try to predict how people will vote, she wants to take a poll with a 90% confidence level

(z*-score of 1.645) and an estimated margin of error of 4%. What is the approximate minimum sample size for Yi’s initial poll?
Mathematics
2 answers:
slega [8]3 years ago
8 0
90The information that you'd need in determining sample size when the standard deviation is unknown is:

z-value for the given level of confidence ⇒ The level of confidence is 90% and the z-value by convention is 1.645

The margin error (E) = 4%

The proportion of the population that you'd expect to vote for Yi. If this information isn't provided, use 50%. We call this value, p, the probability of success.

The probability of not success is q = 1 - 0.5 = 0.5

STEP 1:
Half the margin error = 0.04 ÷ 2 = 0.02

STEP 2:
Multiply the probability of success by the probability of fail = 0.5 × 0.5 = 0.25

STEP 3: 
Divide z-score by half of E = 1.645 ÷ 0.02 = 82.25
Then square the answer = 82.25² = 6765 rounded to the nearest integer)

STEP 4: 
Multiply the answer from STEP 2 by the answer from STEP 4
0.25 × 6765 = 1691 (rounded to the nearest integer)

Answer: Minimum Sample Size is 1691
Savatey [412]3 years ago
5 0

Answer:

D. 1,692 students

Step-by-step explanation:

You might be interested in
I'm a kid i asked that question people do you unerstand
Olegator [25]
YESI had to reread it a couple of times.
5 0
3 years ago
(a - b)(a2 + ab + b2)
Colt1911 [192]

Answer:

THE ANSWER IS THIS FOR THE QUESTION UP TOP

8 0
3 years ago
Which graph represents the solution set for the inequality 16 ≥ -3x + 4 > -17?
Natalka [10]
It is either graph 2 or3
7 0
3 years ago
Pleas help will mark best answer!! <3
natali 33 [55]
You have 4 walls, 2 with length 12 feet, 2 with length 15 feet and each of them has a height of 12 feet
so you sum all the lengths and then multiply it by the height to get the total area

total length=2*(12+15)
=2*(27)
=54
total area=total length*ceiling height
=54*12
=648 feet^2 to cover all walls with wallpaper
8 0
3 years ago
Plz help idk what to do
o-na [289]
Every triangle adds up to 180 degrees
6 0
3 years ago
Other questions:
  • What is 3.25% written as a fraction in lowest terms?
    7·2 answers
  • PLEASE HELP!!!
    14·1 answer
  • What is 81 times 11 i dont know it
    12·2 answers
  • A rectangle has a perimeter of 40 in. and a length of 15 in. What is its area?
    8·2 answers
  • What is the median of the data set? {12, 15, 18, 20, 22, 23, 24, 40, 45} Enter your answer in the box.
    9·2 answers
  • The variable Z is directly proportional to X. When X is 10, Z has the value 190.
    8·1 answer
  • For the equation a(x+6)=-2x+b. If a=3 what value of b will make x=4
    11·1 answer
  • Find the missing lengths in the triangle, if y = 34.10.
    7·1 answer
  • Keith owes $4512 on a credit card with a 17.3% interest rate compounded monthly. What is the monthly payment he should make an o
    5·1 answer
  • Triangle A E C is shown. Line segment B D is drawn near point C to form triangle B D C.
    12·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!