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STA2023 – Inferential Statistics Practice Problems (Ch. 1924)
Each of the following scenarios requires a test of significance (hypothesis test) to answer the question that is posed.
Decide which type of test is appropriate (1Proportion ZTest, 2Proportion ZTest, 1Sample TTest, or 2Sample
TTest) and write an appropriate null and alternative hypothesis for each.
For additional practice, you might want to
run the appropriate hypothesis test using the 6 steps discussed in class and/or using the STAT/TESTS feature of your
calculator.
Also, you might want to practice finding confidence intervals for each and interpret your confidence
interval results (the answer key shows 95% confidence interval results only).
1.
A 10year old study claims that adults spend an
average
of 14 hours on chores during a weekend.
An economist
wanted to check if the current
mean
is still 14 hours.
Recently, a random sample of 200 adults taken by the
economist showed that the sampled adults spend an
average
of 13.55 hours on chores during a weekend.
The
standard deviation of this sample data is 3.1 hours.
Does the sample data provide statistically significant evidence
to conclude that,
on average
, adults now spend fewer than the 14 hours per weekend on chores that was reported
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This note was uploaded on 11/22/2010 for the course STA 2023 taught by Professor Ripol during the Spring '08 term at University of Florida.
 Spring '08
 Ripol
 Statistics, Inferential Statistics

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