UF STA 2023 Exam 1
QUESTIONS AND VERIFIED
CORRECT ANSWERS
GRADED A+ [LATEST] 100%
GUARANTEED PASS
Design - CORRECT ANSWER-plan how to obtain the data
Description - CORRECT ANSWER-summarize the data with graphs and numerical summaries
Inference - CORRECT ANSWER-using data from a random and representative sample to draw
conclusion about population of interest
Subjects - CORRECT ANSWER-persons, animals, or objects in our study/experiment
Variables - CORRECT ANSWER-the characteristics that we measure on each subject
population - CORRECT ANSWER-ALL subjects of interest
sample - CORRECT ANSWER-subjects for whom we have data (small)
parameters - CORRECT ANSWER-numerical summary of the population
statistics - CORRECT ANSWER-numerical summary of the sample
,categorical variables - CORRECT ANSWER-place each observation into groups and they are
usually summarized by the percentage of observations in each group
quantitative variables - CORRECT ANSWER-take on numerical values
Key features of quantitative variables are the center (______) and spread (______) of
observations in each group - CORRECT ANSWER-center=average
spread=variability
Discrete Quantitative Variable - CORRECT ANSWER-take only a finite list of possible outcomes,
such as a count (0,1,2,3...etc)
Continuous Quantitative Variable - CORRECT ANSWER-has an infinite list of possible values that
form an interval, even though sometimes we are limited in our ability to measure them
In 2010, the General Social survey had a question which asked respondents if they were willing
to pay higher prices to help the environment. In 2010, out of 1361 people, 8.2% said that they
were very willing and 14.6% said that they were not at all willing. Are "8.2%" and "14.6%"
statistics or parameters? - CORRECT ANSWER-both are statistics
If someone is interested in examining the center,shape, spread and outliers of the quantitative
data they collected. What would be the appropriate graph to make of the sampled data? -
CORRECT ANSWER-dotplot because the data is quantitative
How do you differentiate between skewed right and skewed left? - CORRECT ANSWER-Trace
your finger over the outline of the data.If the tail goes to the right(higher numbers), it is skewed
right. If the trail goes to the left (lower numbers), it is skewed left.
Empirical Rule - CORRECT ANSWER-The Empirical Rules states that about 68% of the data lies
within one standard deviation of the mean, about 95% of the data lies within two standard
, deviations of the mean and about 99.7% of the data lies within three standard deviations of the
mean.
Suppose that you had the following data set.
100 200 250 275 300
Suppose that the value 250 was a typo, and it was suppose to be 260. How would the value of
the standard deviation change? - CORRECT ANSWER-it would mostly stay the same
Bar charts are used ONLY for ________data - CORRECT ANSWER-categorical data
Finding r when given R squared - CORRECT ANSWER-To find the value of r from R-squared.
First, change it to a decimal by dividing by 100.
Second, take the square root.
Third get the sign by looking at a graph or sign of the slope in the equation
Pie charts are used for ___________data - CORRECT ANSWER-categorical
From 1975 to 1986, the General Social Survey asked its participants if they favored or opposed
capital punishment. A least squares regression line was calculated to predict the percent that
favored the death penalty based on the year. The least squares regression equation is yhat= -
1859+0.9753x. Interpret the slope for this equation. - CORRECT ANSWER-Each year, the percent
that favors capital punishment increases by 0.9753% on average.
QUESTIONS AND VERIFIED
CORRECT ANSWERS
GRADED A+ [LATEST] 100%
GUARANTEED PASS
Design - CORRECT ANSWER-plan how to obtain the data
Description - CORRECT ANSWER-summarize the data with graphs and numerical summaries
Inference - CORRECT ANSWER-using data from a random and representative sample to draw
conclusion about population of interest
Subjects - CORRECT ANSWER-persons, animals, or objects in our study/experiment
Variables - CORRECT ANSWER-the characteristics that we measure on each subject
population - CORRECT ANSWER-ALL subjects of interest
sample - CORRECT ANSWER-subjects for whom we have data (small)
parameters - CORRECT ANSWER-numerical summary of the population
statistics - CORRECT ANSWER-numerical summary of the sample
,categorical variables - CORRECT ANSWER-place each observation into groups and they are
usually summarized by the percentage of observations in each group
quantitative variables - CORRECT ANSWER-take on numerical values
Key features of quantitative variables are the center (______) and spread (______) of
observations in each group - CORRECT ANSWER-center=average
spread=variability
Discrete Quantitative Variable - CORRECT ANSWER-take only a finite list of possible outcomes,
such as a count (0,1,2,3...etc)
Continuous Quantitative Variable - CORRECT ANSWER-has an infinite list of possible values that
form an interval, even though sometimes we are limited in our ability to measure them
In 2010, the General Social survey had a question which asked respondents if they were willing
to pay higher prices to help the environment. In 2010, out of 1361 people, 8.2% said that they
were very willing and 14.6% said that they were not at all willing. Are "8.2%" and "14.6%"
statistics or parameters? - CORRECT ANSWER-both are statistics
If someone is interested in examining the center,shape, spread and outliers of the quantitative
data they collected. What would be the appropriate graph to make of the sampled data? -
CORRECT ANSWER-dotplot because the data is quantitative
How do you differentiate between skewed right and skewed left? - CORRECT ANSWER-Trace
your finger over the outline of the data.If the tail goes to the right(higher numbers), it is skewed
right. If the trail goes to the left (lower numbers), it is skewed left.
Empirical Rule - CORRECT ANSWER-The Empirical Rules states that about 68% of the data lies
within one standard deviation of the mean, about 95% of the data lies within two standard
, deviations of the mean and about 99.7% of the data lies within three standard deviations of the
mean.
Suppose that you had the following data set.
100 200 250 275 300
Suppose that the value 250 was a typo, and it was suppose to be 260. How would the value of
the standard deviation change? - CORRECT ANSWER-it would mostly stay the same
Bar charts are used ONLY for ________data - CORRECT ANSWER-categorical data
Finding r when given R squared - CORRECT ANSWER-To find the value of r from R-squared.
First, change it to a decimal by dividing by 100.
Second, take the square root.
Third get the sign by looking at a graph or sign of the slope in the equation
Pie charts are used for ___________data - CORRECT ANSWER-categorical
From 1975 to 1986, the General Social Survey asked its participants if they favored or opposed
capital punishment. A least squares regression line was calculated to predict the percent that
favored the death penalty based on the year. The least squares regression equation is yhat= -
1859+0.9753x. Interpret the slope for this equation. - CORRECT ANSWER-Each year, the percent
that favors capital punishment increases by 0.9753% on average.
