In: Statistics and Probability
A large national survey shows that the waiting times for fast food restaurants is approximately normally distributed with a mean of μ = 3.4 minutes and a standard deviation of σ = 0.6 minutes.
A fast food outlet claims that their mean waiting time in line
is less than 3.4 minutes.
To test the claim, a random sample of 60 customers is selected, and
is found to have a
mean of 3.3 minutes
Use this sample data to test the fast food outlet's claim at a .05 significance level .
The test statistic is calculated using the
formula mentioned. The critical value is obtained from
STATKEY(image attached for reference). We compare the test
statistic with the critical value and make the required
conclusion.