Question

Light Food group, claims that 90 percent of its orders needs 8 minutes, to be delivered, from the time the order is placed. A sample of 200 orders revealed that 186 were delivered within the promised time. At the 0.04 significance level, can we conclude that the claim of the group is incorrect? Question: What dose characterize this problem? Note complete the needed calculation and then mark the correct answer Select one: a. Proportion problem, One tailed, the critical value is Z=1.76, standard error=0.02, and the test statistica - 1.5 b. Proportion problem, Two tailed, the critical value is Z-2.06, standard error= 0.02, and the test statistica - 1,5 c. Other d. Proportion problem, Two tailed, the critical value is Z=2.06, standard error=0.02. and the test statistic=1.5 e. Mean Problem, Two tailed, the critical value is Z-2.06, standard error 0.02, and the test statistics 1.5

Answer 1

p = 186/200 = 0.93
Standard error = √(0.93*(1-0.93)/200) = 0.02
Test statistic = (0.93-0.90)/0.02 = 1.5
From standard normal table, critical value is 2.06 for at 0.04 significance level.

So, the correct option is option 'd', i.e. proportion problem, Two tailed, the critical value is Z=2.06, standard error=0.02, and the test statistic=15.

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