a-For over 25 years Fishy company has been selling canned sardines, mainly with a net weight of 425 grams. To your surprise, management has not tested the actual weight of the can in the last three years, and you wonder if the net weight of 425 grams is still appropriate. What would be the null and alternative hypothesis to test this?
b- Say that Ho : µ ? 25.5 Ha : µ < 25.5
If n = 50, ? = 5 and ? = 0.01 and X is normally distributed,
compute the
p-value and state if you reject the null or not when,
(b) x= 24.7
c-An engineer was proud to have installed a new solar system at
his house.
The system was economically feasible because surplus power
generated was
sold to the power company. To the engineers dismay though, right
after
installation the system stopped selling back to the power company
from
around 11am to about 3pm every single day. After some observations,
he
noticed that the voltage on the power grid seemed to be higher than
the
expected value, 120 volts. If the voltage in the power grid is too
high, then
due to federal regulations he will not be able to sell power back
to the grid.
He took 30 random voltage measurements during the time of the day
in
question and got an average of 130 volts. The engineer was able to
?nd
out that the power grid voltage for the area is normally
distributed with a
standard deviation of 1 volt. Conduct the ?ve steps of hypothesis
testing to
determine if mean voltage in his neighborhood is higher than 120
volts at
5% signi?cance.
a)state null and alternative
b)What kind of test statistic should be used
c)Find the value of the test statistic
d): Find the p-value
a-For over 25 years Fishy company has been selling canned sardines, mainly with a net weight...
For over 25 years Fishy company has been selling canned sardines, mainly with a net weight of 425 grams. To your surprise, management has not tested the actual weight of the can in the last three years, and you wonder if the net weight of 425 grams is still appropriate. What would be the null and alternative hypothesis to test this? a) H0: ? ? 425 , H1: ? > 425 b) H0: ? > 425 , H1: ? ?...