Use Excel please.( norm.inv, t.inv, )
QUESTION 2
(a) Suppose that your task is to estimate the mean of a normally
distributed population to within 8 units with 95% confidence and
that the population standard deviation is known to be 72. What
sample size should be used if you wish to estimate the population
mean to within 8 units?
(b) Determine the minimum sample size required for estimating the
population proportion of number of people who drive to work, to
within 0.002, with 90% confidence.
(c) As a manufacturer of golf clubs, a major corporation wants to
estimate the proportion of golfers who are right-handed. How many
golfers must be surveyed if they want to be within 0.03 with a 99%
confidence level:
i. assuming that there is no information available that could be
used as an estimate of p?
ii. assuming that the manufacturer has an estimate of p obtained
from a previous study that suggests that 75% of golfers are
right-handed?
(d) The population proportion of voters in favour of a particular
political
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