The alternating current (AC) breakdown voltage of an insulating liquid indicates its dielectric strength. An article gav

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The alternating current (AC) breakdown voltage of an insulating
liquid indicates its dielectric strength. An article gave the
accompanying sample observations on breakdown voltage (kV) of a
particular circuit under certain conditions.
(a)
Construct a boxplot of the data.
(b)
Calculate and interpret a 95% CI for true average breakdown
voltage 𝜇. (Round your answers to one decimal place.)
,
Interpret the resulting interval.
We are 95% confident that the true population mean lies above
this interval.We are 95% confident that the true population mean
lies below this interval. We are 95%
confident that this interval does not contain the true population
mean.We are 95% confident that this interval contains the true
population mean.
Does it appear that 𝜇 has been precisely estimated?
Explain.
This interval is quite narrow relative to the scale of the data
values themselves, so it could be argued that the mean has not been
precisely estimated.This interval is quite wide relative to the
scale of the data values themselves, so it could be argued that the
mean has been precisely estimated. This
interval is quite narrow relative to the scale of the data values
themselves, so it could be argued that the mean has been precisely
estimated.This interval is quite wide relative to the scale of the
data values themselves, so it could be argued that the mean has not
been precisely estimated.
(c)
Suppose the investigator believes that virtually all values of
breakdown voltage are between 40 and 70. What sample size would be
appropriate for the 95% CI to have a width
of 2 kV (so that 𝜇 is estimated to
within 1 kV with 95% confidence)? (Round your answer
up to the nearest whole number.)
circuits