Tema
Q:
Which Python module is used to create confidence intervals? Select one.
scipy
pandas
math
Q:
3 Sampling Distribution of the Sample Mean
If we are interested in summarizing a variable with the mean, are we dealing with categorical or
quantitative data?
Q:
Consider the following import statement in Python, where the statsmodels module is
called in order to use the ztest method. What are the inputs to ztest method? Select
one.
from statsmodels.stats.weightstats import ztest
None of the above
count of observations that meet a condition (count), total number of
observations (nobs)
A dataframe column (an array) of data values, hypothesized value of the
population mean.
zscore for the level of significance (zscore), hypothesized value of the population
mean.
Q:
Which of the following Python methods is used to perform hypothesis testing for a
population mean when the population standard deviation is unknown? Select one.
ttest_1samp(dataframe, null hypothesis value)
prop_1samp_hypothesistest(dataframe, n, alternative hypothesis value)
ztest(dataframe, null hypothesis value)
ttest(dataframe, null hypothesis value)
Q:
A professor would like to investigate whether surfers are more likely than nonsurfers to get skin cancer. From the students at his university, he follows 100 at random that surf and 100
that do not surf. Fifty years from now, he will analyze whether more surfers got skin cancer than nonsurfers.
a. Is this an experiment or an observational study? Why?
b. Summarize at least three practical difficulties with this planned study.
Q:
c. Encuentra las medidas de tendencia ce
tral para estos resultados.
Q:
A professor would like to investigate whether surfers are more likely than nonsurfers to get skin cancer. From the students at hor surf. Fifty years from now, he will analyze whether more surfers got skin cancer than nonsurfers.
a. Is this an experiment or an observational study? Why?
b. Summarize at least three practical difficulties with this planned study.
a. Is this an experiment or an observational study? Why?
Q:
\( 68 \% \) of the tire sets tested had a life span between 38,000 miles and 42,000 miles.
How many sets of tires would this be?
If 10,000 sets of this tire were produced, how many sets would you expect to wear-out before
reaching 36,000 miles?
Q:
If 10,000 sets of this tire were produced, how many sets would you expect to wear-out before
reaching 36,000 miles?
Q:
e.) \( 95 \% \) of the students who took the test had scores between
52
and 88 . How many students would this be?
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