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STA 2381 Exam |Questions with Correct Verified Answers
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STA 2381 Exam |Questions with CorrectVerified Answers
A study examined the economic rewards of obtaining an MBA degree. The researchers made
inferences based on wage data collected for a sample of individuals who sat for a particular
examination required for most MBA programs. The researchers used government wage data
for those who took the exam during a selected four-year time period, examining wage data
from a two-year period after degrees were obtained. Their wages were compared to those of
people who took the exam in the same period and did not obtain their degree. What method
was used to collect the sample data? - ANSWER The data were collected observationally.
A study examined the economic rewards of obtaining an MBA degree. The researchers made
inferences based on wage data collected for a sample of individuals who sat for a particular
examination required for most MBA programs. The researchers used government wage data for
those who took the exam during a selected four-year time period, examining wage data from a
two-year period after degrees were obtained. Their wages were compared to those of people
who took the exam in the same period and did not obtain their degree. Do you think the final
sample is representative of the population? Why or why not? Comment on potential biases in
the sample. - ANSWER Yes, because the data of all people who took the exam in the time
period were obtained.
A study examined the stress amounts of working additional hours. In the study, the researchers
investigated the link between weekly hours worked and stress level (measured on a 6-point
scale where 1= "not stressed and 6= "very stressed"). Participants for the study were those who
used a popular social networking Web site. The Web site's directory was searched for those
with "average" names (e.g. "John Smith", "Sara Jones"). These individuals were then invited to
participate in an online survey in exchange for a $20 gift certificate. Of the respondents, those
who worked very many or very few hours were excluded, leaving a sample size of 48
respondents. Identify the experimental units for this study. - ANSWER People who used a
particular Web site.
A study examined the stress amounts of working additional hours. In the study, the researchers
investigated the link between weekly hours worked and stress level (measured on a 6-point
, scale where 1= "not stressed and 6= "very stressed"). Participants for the study were those who
used a popular social networking Web site. The Web site's directory was searched for those
with "average" names (e.g. "John Smith", "Sara Jones"). These individuals were then invited to
participate in an online survey in exchange for a $20 gift certificate. Of the respondents, those
who worked very many or very few hours were excluded, leaving a sample size of 48
respondents. What are the variables of interest? Are they quantitative or qualitative in nature?
- ANSWER Weekly hours worked, quantitative; stress level, qualitative.
A study examined the stress amounts of working additional hours. In the study, the researchers
investigated the link between weekly hours worked and stress level (measured on a 6-point
scale where 1= "not stressed and 6= "very stressed"). Participants for the study were those
who used a popular social networking Web site. The Web site's directory was searched for
those with "average" names (e.g. "John Smith", "Sara Jones"). These individuals were then
invited to participate in an online survey in exchange for a $20 gift certificate. Of the
respondents, those who worked very many or very few hours were excluded, leaving a sample
size of 48 respondents. Describe the population of interest. - ANSWER All workers.
A study examined the stress amounts of working additional hours. In the study, the researchers
investigated the link between weekly hours worked and stress level (measured on a 6-point
scale where 1= "not stressed and 6= "very stressed"). Participants for the study were those who
used a popular social networking Web site. The Web site's directory was searched for those
with "average" names (e.g. "John Smith", "Sara Jones"). These individuals were then invited to
participate in an online survey in exchange for a $20 gift certificate. Of the respondents, those
who worked very many or very few hours were excluded, leaving a sample size of 48
respondents. Do you believe the sample of 48 respondents is representative of the population?
Explain. - ANSWER No, selection bias is present since only those with "average" names could
participate, and the group of these that did was self-selected.
Mean v Median v Mode - ANSWER The mean, median, and more are the most important
measures of central tendency. The mean of a data set is it's arithmetic average. The median of a
data set is the middle value in its ordered list. The mode of a data set is its most frequently
occurring value.
Mean v Median - ANSWER The mean is affected by extreme values, while the median is not.
If the data set is skewed to the right, then the median is less than the mean. If the data set is
symmetric, the mean equals the median. If the data set is skewed to the left, the mean is less
than the median.
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