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
AlladinOne [14]
3 years ago
9

You want to test your newly created Web site, so you have 250 people access it from random locations at random times. Of the peo

ple accessing the site, 75 of them experience computer crashes. You want to estimate the proportion of crashes within a margin of error of 4% at a 95% confidence interval. What sample size do you need?
Mathematics
1 answer:
Arte-miy333 [17]3 years ago
6 0

Answer: 505

Step-by-step explanation:

The formula to find the sample size n , if the prior estimate of the population proportion (p) is known:

n= p(1-p)(\dfrac{z}{E})^2 , where E=  margin of error and z = Critical z-value.

Let p be the population proportion of crashes.

Prior sample size = 250

No. of people experience computer crashes = 75

Prior proportion  of crashes p=\dfrac{75}{250}=0.3

E= 0.04

From z-table , the z-value corresponding to 95% confidence interval = z=1.96

Required sample size will be :

n=0.3(1-0.3)(\dfrac{1.96}{0.04})^2 (Substitute all the values in the above formula)

n= (0.21)(49)^2= 0.21\times2401

n= 504.21\approx505   (Rounded to the next integer.)

∴ Required sample size = 505

You might be interested in
85% of 16,000,000 people in the Netherlands own a bike, and most of them ride every day. Which equation would you use to find ho
Scilla [17]

Answer:

Multiplication 0.85 X 16,000,000=13600000

Step-by-step explanation:

0.85 X 16,000,000=13600000

4 0
2 years ago
26. During a sale, a store offered a 20% discount on a particular camera that was originally priced at $450.
NARA [144]

Answer:

D.$315

Step-by-step explanation:

$450=100%

100%-20%-10%=70%

$450×70%=$450×70/100

=$315

7 0
3 years ago
Read 2 more answers
Given the diagram below, find the measure in degrees of angle b & angle c
kifflom [539]
The answer is B=34,C=68
8 0
3 years ago
Find the measure of one interior angle of the regular polygon shown below
alisha [4.7K]

Answer:

c

Step-by-step explanation:

7 0
3 years ago
Read 2 more answers
A contest on a game show receives -25 points for each wrong answer what integer represents the change in periods after three wro
Paladinen [302]
To represent the change in points, you can think of it in two ways:

1.  You will go down 25 points for every wrong answer, so -25 + -25 + -25 would represent what is happening.  They are all negative, so you keeping moving down in value.  

2.  You can also think of this as 3 groups of -25. 

Both answers are -75.  The answer is negative because the change was down in points.

-75 is the integer that represents this situation.
7 0
3 years ago
Other questions:
  • Needs steps to solve the following a^2 + 7ab + 10b^2
    8·1 answer
  • Jeffrey bought t T-shirts. The shirts came in 4 packages. Write an expression that shows how
    8·1 answer
  • Which counterexample shows that the conjecture "The square of a number is
    6·1 answer
  • PLEASE HELP I GOT STUCK HELP ASAP
    12·1 answer
  • A sign language club made $627.50 from selling popcorn at a festival. The popcorn cost the club $95.00. Which expression represe
    13·2 answers
  • Anyone know how to solve this?
    11·1 answer
  • Zellie is taking the stairs in her building from her floor to the top of the building. After 2 minutes, she was 100 steps from t
    8·1 answer
  • PLEASE ANSWER ASAp thank you
    12·2 answers
  • I NEED HELP WITH C , help i dont understand
    10·1 answer
  • 25 Points + BRANIEST. PLEASE HELP
    12·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!