The number of persons sharing a pie to the number of slices of the pie

Answers

• Réponse publiée par: nila93

  How is that question!?
• Réponse publiée par: cleik

  Confidence interval for the population mean
  z-test or normal distribution
  solution:
  given:  
  n=20, x̄ =89, s=2.0, 99% 
  formula:
  x̄ -z_alpha/2(s/square root of n)< µ< x̄ +z_alpha/2(s/square root of n)
  89-(2.575)(2.0/square root of 20)< µ< 89-(2.575)(2.0/square root of 20)
  87.848< µ< 90.152
  
  margin of error:
  solution:
  the critical value is 2.575.
  the standard deviation is 2.0 (from the question), but as this is a sample, we need the standard error for the mean. 
  the formula for the se of the mean is  standard deviation / √(sample size), so: 2.0/ √(20)=0.447.
  me=2.575 * 0.447 = 1.151.
  
  therefore, the margin of error is 1.151  with the confidence interval of 87.848< µ< 90.152.
• Réponse publiée par: rhaineandreirefuerzo

  “if cloud is not dark, then it will not rain”