STAT200 UMUC E322 Statistic Week 1 Process to Collect a Sample Problems Please read the questions carefully and answer to the best of your knowledge. For t

STAT200 UMUC E322 Statistic Week 1 Process to Collect a Sample Problems Please read the questions carefully and answer to the best of your knowledge. For the charts please try and place everything in 1 document. If printed, fill in the blank ?
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STAT 200 Week 1 Homework Problems
1.1.4 To estimate the percentage of households in Connecticut which use fuel oil as a heating source, a
researcher collects information from 1000 Connecticut households about what fuel is their heating source.
State the individual, variable, population, sample, parameter, and statistic
1.2.4 You wish to determine the GPA of students at your school. Describe what process you would go
through to collect a sample if you use a stratified sample.
1.3.4 To evaluate whether a new fertilizer improves plant growth more than the old fertilizer, the fertilizer
developer gives some plants the new fertilizer and others the old fertilizer. Is this an observation or an
experiment? Why?
1.3.10 A mathematics instructor wants to see if a computer homework system improves the scores of the
students in the class. The instructor teaches two different sections of the same course. One section
utilizes the computer homework system and the other section completes homework with paper and pencil.
Are the two samples matched pairs or not? Why or why not?
1.3.16 To determine if a new medication reduces headache pain, some patients are given the new
medication and others are given a placebo. Neither the researchers nor the patients know who is taking
the real medication and who is taking the placebo. Is this a blind experiment, double blind experiment, or
neither? Why?
1.4.2 Suppose a car dealership offers a low interest rate and a longer payoff period to customers or a high
interest rate and a shorter payoff period to customers, and most customers choose the low interest rate and
longer payoff period, does that mean that most customers want a lower interest rate? Explain.
2.1.4 In Connecticut households use gas, fuel oil, or electricity as a heating source. Table #2.1.7 shows
the percentage of households that use one of these as their principle heating sources (“Electricity usage,”
2013), (“Fuel oil usage,” 2013), (“Gas usage,” 2013). Create a bar chart and pie chart of this data. State
any findings you see from the graphs.
Table #2.1.7: Data of Household Heating Sources
Heating Source
Electricity
Fuel Oil
Gas
Other
Percentage
15.3%
46.3%
35.6%
2.8%

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