1. Question: In a random sample of 350 attendees of a minor league baseball game, 184 said that they bought food from the concession stand. Create a 95% confidence interval for the proportion of fans who bought food from the concession stand. Use Excel to create the confidence interval, rounding to...
Understanding Confidence Intervals – Excel
Week 6
1. In a random sample of 350 attendees of a minor league baseball game, 184 said
that they bought food from the concession stand. Create a 95% confidence interval for
the proportion of fans who bought food from the concession stand. Use Excel to create the
confidence interval, rounding to four decimal places. 0.4734 < P < 0.5780
2. Alison, the owner of a regional chain of pizza stores, is trying to decide whether to add
calzones to the menu. She conducts a survey of 700 people in the region and asks
whether they would order calzones if they were on the menu. 46 people responded “yes.”
Create a 90% confidence interval for the proportion of people in the region who would
order calzones if they were on the menu.Round your answer to four decimal places.
0.0503 and 0.0811
3. A company wants to determine a confidence interval for the average CPU time of its
teleprocessing transactions. A sample of 70 random transactions in milliseconds is given
below. Assume that the transaction times follow a normal distribution with a standard
deviation of 600 milliseconds. Use Excel to determine a 98% confidence interval for the
average CPU time in milliseconds. Round your answers to the nearest integer and use
ascending order.
(5,906, 6,240).
4. A sample of 22 test-tubes tested for number of times they can be heated on a
Bunsen burner before they crack is given below. Assume the counts are normally
distributed. Use Excel to construct a 99% confidence interval for μ. Round your answers
to two decimal places and use increasing order.
(1071.77, 1477.33).
5. Question
Suppose that the scores of bowlers in a particular league follow a normal
distribution such that the standard deviation of the population is 12. Find
the 95% confidence interval of the mean score for all bowlers in this league
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