• Accueil
• Math
• May ran a race. she paused for a water 25% of the...

# May ran a race. she paused for a water 25% of the way through the race. she stop to tie her shoe 40% of the wqy. her friends were cheering her 90% of the way through the race. draw a diagram to show were these events took place?

• Réponse publiée par: jbaningzzz
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: danigirl12

step-by-step explanation:

because if their are teachers included they must show their skills and knowledge about this position

• Réponse publiée par: reyquicoy4321