An article reported that 27% of US consumers would prefer to have a car that runs on diesel than gasoline. Suppose you suspect that the proportion might be different in your city than
where this survey was conducted. What is the required sample size if you want to estimate the
proportion to within .05 with a 95% confidence?
Remember: ME=2*
|p(1-p)
A. 385
B. 384
O
C. 303
D. 302

answer: 298143

step-by-step explanation:

d. 24+-0.114

step-by-step explanation:

the question requires us to calculate the approximate 95% confidence interval for the mean number of ounces of ketchup per bottle in the sample given the following statistics;

sample mean = 24

standard deviation, σ = 0.4

sample size , n = 49

the confidence interval for a population mean is calculated using the formula;

sample mean ± z-score*(σ/sqrt(n))

the z-score associated with a 95% confidence interval, from the standard normal tables, is;

1.96

substituting these values into the formula;

24 ± 1.96*(0.4/7)

= 24 ± 0.112

from the alternatives given, choice d is closest to the above expression;

what