This is the same type of problem as your previous post on confidence intervals.
Use the same formula with these values:
n = 1003
mean = 18.9
sd = 19.9
I'll let you take it from here.
A poll conducted in 1972 asked 1003 people, " During the past year, about how many books did you read either all or part of the way through?" Results of the survey indicated that x-bar=18.9 books and s=1
9.9 books.
A)Construct a 95% confidence interval for the mean number of books read either all or part of during the preceding year. Interpret the interval.
____,_____
3 answers
MathGuru, how do i determine the z-score for this one?
95% confidence = 1.96
You can determine these values by using a z-table. Make a note of the more commonly used confidence intervals so you don't have to constantly refer to the table. It will help you remember them too.
You can determine these values by using a z-table. Make a note of the more commonly used confidence intervals so you don't have to constantly refer to the table. It will help you remember them too.
1 answer