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
Examine the following three premises: i. All kids who have a smartphone play mobile legends.
atroni [7]

Answer:

The increasing number of students who are hooked on playing online mobile games (OMG) is alarming. As such, this study was realized to address the problem. This study assessed the gaming profile towards OMG and its relation to the academic performance of the engineering students of Eastern Visayas State University Tanauan Campus (EVSUTC). Specifically, the study investigated the correlation between student's number of hours spent on playing OMG (at school and home), commonly played OMG (at school and home), reasons for playing OMG and attitudes on playing OMG with academic performance utilizing Eta and Pearson r correlation analyses. A random sample of 134 student respondents were selected through purposive sampling of those who are playing OMG using their mobile phones. Descriptive correlational research design was utilized and a validated survey instrument was employed to gather the needed information. The findings revealed that majority of the students played mobile legends and spent mostly 2 hours playing OMG for a reason of boredom. The overall attitudes of the students on playing OMG were interpreted as Less Favorable (M=2.58, SD=1.13). Out of the independent variables being set in the study, the number of hours spent on playing OMG at home (r=-0.188, p=0.039) and commonly played OMG at school (r=0.203, p=0.045) were found significantly correlated with student's academic performance. Hence, the students' time spent on playing OMG at home and the type of games that students played at school have significant bearing to their academic performance. As such, delimiting student's usage of internet can be made to address the problem.

3 0
1 year ago
Help! Help! Anyone! Please!
nika2105 [10]

Answer:

86=8h

Step-by-step explanation:

4 0
3 years ago
Read 2 more answers
Pls help urgently extra points and mark brainlist
Andreas93 [3]

Answer:

7

Step-by-step explanation:

9 is not a prime factor and of you divide 210 with 11, it will be a decimal

5 0
3 years ago
If 3a + 2b = 7 and 2a + 2b = 9 , what is the value of
Simora [160]
Hey there :)

We have two equations:
3a + 2b = 7 
2a + 2b = 9

We need to solve simultaneously to find the values of a and b

eq.1    3a + 2b = 7
eq.2 ( 2a + 2b = 9 ) x -1  ) multiply by -1 to cancel 2b

  3a + 2b = 7
- 2a - 2b = -9         ( Add both together )
-------------------
   a = - 2 

Substitute the value you found for a in a in order to find b

3( - 2 ) + 2b = 7                                                     2( - 2 ) + 2b = 9 
- 6 + 2b = 7                                    OR                  - 4 + 2b = 9
2b = 13                                                                   2b = 13        
b = \frac{13}{2}                                                                 b = \frac{13}{2} 

3 0
3 years ago
Given a=4,b=-2 and c=8, evaluate -|b-a|<br><br> -2<br> -6<br> 6
Salsk061 [2.6K]

Answer: -6


Step-by-step explanation: -|b-a|

-|-2-4|

-|-6|

-6

Once you get rid of the absolute value bars the negative sign is still outside of them making 6 negative again. Hope this helped! :P


5 0
3 years ago
Read 2 more answers
Other questions:
  • What is the effect on the figure k &gt; 1 show your work please thankssss
    15·2 answers
  • Which statement is true about a number and its additive inverse?
    9·2 answers
  • Does choosing a blue marble represent the complement event of choosing a red marble? Explain.
    8·2 answers
  • To properly use the Addition Property of Equality what number would have to be added in the equation, 14 = x - 6?
    9·2 answers
  • La señora Alcántara realiza una compra en el supermercado fortuna, ella solo tiene 12,400 pesos ,compra varios artículos y su co
    9·1 answer
  • I need help with this one
    10·1 answer
  • Can someone please help me?!?!?!?
    10·1 answer
  • What is 2 copies of 1/6
    12·1 answer
  • Help ASAP pleaseee!
    5·1 answer
  • Question 4
    6·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!