When students in class were asked their preference for the type of crust for a pizza,...
When students in class were asked their preference for the type of crust for a pizza, 23% preferred deep dish or pan pizza, 35% prefer a thin/crispy pizza crust, while 42% preferred the traditional or hand toss pizza crust. Find the 90% confidence interval for the proportion of students who prefer a thin/crispy pizza crust using a sample of 100 students. Round to three decimal places.
Homework Answers
Given that, proportion of students prefer a thin/crispy pizza crust is 35% or 0.35
sample size = 100
A 90% confidence level has significance level of 0.10 and
critical value is, 
The 90% confidence interval for p is,
Therefore, the 90% confidence interval for the proportion of students who prefer a thin/crispy pizza crust using a sample of 100 students is (0.272, 0.428)
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