TV A student doing research in psychology is interested in knowing how much tele
ID: 3042940 • Letter: T
Question
TV A student doing research in psychology is interested in knowing how much television is
watched by preschoolers who live in Oswego. There are preschoolers enrolled at the Children’s
Center, a day care facility located on campus, and serving faculty and students with children.
The student places surveys in the mailboxes at the center, asking parents to complete them. Each
parent is asked to report the average daily mount of television (in minutes – parents report to the
nearest 14 hour = 15 minutes) viewed by their child. The student collects the data (see it in the
file TV.MTW), and obtains a 95% confidence interval: 37.22 < < 50.82. Interpret this interval!
5¢ What is the average age of all nickels currently in circulation? Before analyzing data, we need
to procure data. How much data? We want to be 99% confident that our sample mean is within 1
year of the population mean.
The book suggests a pilot study (google “pilot study” to learn about it). Conduct one – a sample
of size 20 or so will do. Report on the relevant result below.
Use this result to determine the necessary sample size. Write the formula and substitute your
values to show how you arrive at your sample size.
Sample at least ________________ nickels.
Explanation / Answer
Solving the first question .
A 95% confidence interval of (37.22 < < 50.82) means that we can be confident that the mean value liess between 37.22 and 50.82 at least 95% of the times.
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