Suppose the amount of propane used per customer in a month is normally distributed with
. Find a 95 confidence interval for
if a randomly chosen sample of 30 customers has a mean propane usage of 110 gallons a month.
a.(78.6, 141.4)
b.(105.2, 114.8)
c.(103.2, 116.8)
d.(104.3, 115.7)
Question 2 Which of the following is
not a correct statement with regards to estimating a mean
using a known
?
a.If the sampling distribution for sample means
has a mean equal to
and a standard error equal to
and the randomly sampled population is normally distributed, then the sampling distribution of
has a normal distribution.
b.The sampling distribution of
is normally distributed only if the sampled population is normally distributed.
c.A necessary assumption for estimating a mean
using a known
is that the sampling distribution of
is normally distributed.
d.If the sampling distribution for sample means
has a mean equal to
and a standard error equal to
and the randomly sampled population is not normally distributed, then the sampling distribution of
is approximately normally distributed only for sufficiently large sample sizes.
Bank teller assisting with customer service.
How to find the limits of trigonometry functions
Check heat source for temperature. Evaluate the amount of heat given off from the source using your ...
How to find the inverse of any function (Part 2)
Use a graphical method to find the length of the loan to the nearest year
Find the solution set of each of the following equations and inequalities.