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MATH 225N WEEK 6 STATISTICS QUIZ WITH ANSWERS LATESTDOWNLOAD 2022
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MATH 225N WEEK 6 STATISTICS QUIZ WITH ANSWERS LATESTDOWNLOAD 2022
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MATH 225N WEEK 6 STATISTICS QUIZ WITHANSWERS
Question
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.
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.
,Question
Suppose scores on exams in statistics are normally distributed with an unknown population
mean. A sample of 26 scores is given below. Use Excel to find a 90% confidence interval for
the true mean of statistics exam scores. Round your answers to one decimal place and use
increasing order.
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 using the accompanying data set of 40 random scores.
Round your answers to two decimal places and use ascending order.
, 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 four decimal places.
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