Question
MATH399 Applied Managerial Statistics
Week 1 Assignment Statistical Study Design
QuestionA farmer divided his land into 2 groups of sections
randomly. There is no difference in the quality of the soil between
the 2 groups of land. He used Type A seeds in the first group and
Type B seeds in the second group. After 3 months, the heights of
the crops are measured across the two groups of land sections. Is
the study observational or experimental? If it is an experiment,
what is the controlled factor?
The study is an observational study.
The study is an experiment. The controlled factor is
the seed type.
The study is an experiment. The controlled factor is
the land.
The study is an experiment. The controlled factor is
the growth of the crops.
QuestionIn a study to add a new feature to a software
program, the programmer introduced two categories, men and women,
in the survey she conducted. Is the study observational or
experimental? If it is an experiment, what is the controlled
factor?
The study is an experiment. The controlled factor is the
feature to be added in the software.
The study is an experiment. The controlled factor is
the category, men or women.
The study is an observational study.
The study is an experiment. The controlled factor is
the survey.
QuestionA study was performed with a random sample of 5
people from a certain city. What population would be appropriate
for generalizing conclusions from the study, assuming the data
collection methods used did not introduce biases?
The conclusions should be restricted to only the city that
was sampled.
The conclusions are generalizable to all people on
Earth.
The conclusions are generalizable to all people in the
country.
The conclusions apply only to the sample.
The conclusions apply to people in any city.
QuestionA researcher is interested in the effects of watching
videos just before bed on the quality of sleep. Which of the
following claims would be appropriate for this situation? Select
only one answer choice.
Watching videos just before bed reduces quality of sleep.
More than 60% of people watch videos just before going
to bed.
Watching 1 hour of video just before going to bed
reduces the number of minutes of REM sleep by more than 10%.
Watching 1 hour of video just before going to bed
reduces the quality of sleep.
QuestionA researcher wants to evaluate the effect of using
Facebook on happiness. Would an experimental or observational study
design be more appropriate?
An experimental study should be used with the use of Facebook
as the controlled factor.
An experimental study should be used with happiness as
the controlled factor.
An observational study should be used because it is not
possible to control the use of Facebook.
An observational study should be used because it is not
possible to control happiness.
QuestionAn energy drink manufacturer wants to find out the
effect of different amounts of their product on the maximum
anaerobic power level for rowers. Would an experimental or
observational study design be more appropriate?
An experimental study should be used with the maximum
anaerobic power as the controlled factor.
An experimental study should be used with the amount of
the drink consumed as the controlled factor.
An observational study should be used because the
amount of the drink consumed cannot be controlled.
An observational study should be used because the
maximum anaerobic power cannot be directly controlled.
QuestionA researcher is interested in the effects of watching
videos just before bed on the quality of sleep. He has decided to
test the claim “Watching 1 hour of video just before going to bed
reduces the number of minutes of REM sleep by more than 10%. ”
Which of the following data collection processes would be
appropriate? Select only one answer choice.
Choose a random sample of people and ask them how many hours
of video they watched last night and how much REM sleep they had.
Choose a random sample of people. Randomly select half
of them and have them watch one hour of video just before going to
bed, and then monitor their sleep. Have the other half not watch
any video and monitor their sleep.
Choose a random sample of people. On multiple randomly
selected nights, randomly assign each person to either watch one
hour of video or not watch video and monitor their sleep.
Choose a random sample of people. On multiple randomly
selected nights, measure the amount of video they watch and monitor
their sleep.
QuestionA study was performed with a random sample of 513
bolts produced at one factory. What population would be appropriate
for generalizing conclusions from the study, assuming the data
collection methods used did not introduce biases?
The conclusions would apply to all bolts produced by that
factory.
The conclusions would apply to all bolts produced by
any factory run by the same company.
The conclusions would apply to all bolts of the same
type produced by any manufacturer.
The conclusions apply only to the bolts in the
sample.
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