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Statistics STA 2023 Midterm Review (Tests 1, 2, 3) Questions and Complete Solutions Graded A+
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Statistics STA 2023 Midterm Review (Tests 1, 2, 3) Questions and Complete Solutions Graded A+
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Statistics STA 2023Midterm Review (Tests 1,
2, 3) Questions and
Complete Solutions
Graded A+
Which of the following correctly describes the relationship between a parameter and a statistic? -
Answer: A statistic is calculated from sample data and is generally used to estimate a parameter.
A study was done to determine the average commute time per week to and from class for an SPC
student attending a lecture class. For convenience, a sample of 60 students was taken by randomly
selecting a lecture class on the Gibbs campus (30 students), and also a lecture class on the Clearwater
campus (30 students). The students selected for the sample were then asked where they were
commuting from, when, and how often. The information was then entered into a GPS system in order to
obtain estimated commuting times. Identify the population. - Answer: All SPC students who attend
lecture classes.
Which branch of statistics deals with the organization and summarization of collected information? -
Answer: descriptive
From past figures, it is predicted that 19% of the registered voters in California will vote in the June
primary. Identify whether the statement describes inferential statistics or descriptive statistics. - Answer:
inferential
The cost of a Statistics textbook. Classify the variable as qualitative or quantitative. - Answer:
quantitative
Eye Color. Classify the variable as qualitative or quantitative. - Answer: qualitative
, A study where a drug was given to 23 patients and a placebo to another group of 23 patients to
determine if the drug has an effect on a patient's illness. Decide which method of data collection you
would use to collect data for the study. Specify either observational study, experiment, simulation, or
survey. - Answer: experiment
A study where a political pollster wishes to determine if his candidate is leading in the polls for an
upcoming election. Decide which method of data collection you would use to collect data for the study.
Specify either observational study, experiment, or simulation. - Answer: observational study
50 sophomores, 30 juniors and 20 seniors are randomly selected from 500 sophomores, 300 juniors and
200 seniors at a certain high school. Identify the sampling method used. - Answer: stratified
Every fifth person boarding a plane is searched thoroughly. Identify the sampling method used. -
Answer: systematic
At a local community college, five statistics classes are randomly selected out of 20 and all of the
students from each class are interviewed. Identify the sampling method used. - Answer: cluster
A community college student interviews everyone in their statistics class to determine the percentage of
students that own a car. Identify the sampling method used. - Answer: convenience
A fitness instructor measured the heart rates of the participants in a yoga class at the conclusion of the
class. The data is summarized in the histogram below. There were fifteen people who participated in the
class between the ages of 25 and 45. What percent of the participants had a heart rate between 130 and
150 bpm? - Answer: 47%
The heights (in inches) of ten randomly chosen American males are shown below. Find the mean score.
71 67 67 72 76 72 73 68 72 72 - Answer: 71
The heights (in inches) of ten randomly chosen American males are shown below. Find the median
score.
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