1.D.G co. has an average gross sales of 37 million per week from their products in all outlets with a standard deviation of 6 million. An area manager found out that the average gross sales from the 32 outlets under his area is 34.8 million per week. Is the mean sales of the products in 32 branches significantly different from the mean sales in all outlets? Use ∝ = 5% a. Perform the 5 steps in testing hypothesis with two-tailed or two- sided tests. b. Perform the 5 steps in testing hypothesis with one tailed or one - sided tests. And N= 45 branches. (All other given are the same)
1.D.G co. has an average gross sales of 37 million per week from their products in all
outlets with a standard deviation of 6 million. An area manager found out that the average
gross sales from the 32 outlets under his area is 34.8 million per week. Is the
of the products in 32 branches significantly different from the mean sales in all outlets?
Use ∝ = 5%
a. Perform the 5 steps in testing hypothesis with two-tailed or two- sided tests.
b. Perform the 5 steps in testing hypothesis with one tailed or one - sided tests.
And N= 45 branches. (All other given are the same)
2. The subject coordinator wants to find out if the webcasting methods of teaching social
sciences subjects more effective than the existing standard method of teaching. Two classes
of approximately equal intelligence were selected. From one class, the teacher selected
students in random as experimental group for webcasting methods, And from the other class,
the teacher selected another sample students for existing standard method of teaching as
controlled group. After one trimester , the same tests were given to the students. The mean
scores are shown in the following table.
Method of teaching Mean score Standard deviation Class size
E-learning and web
casting
x̅1 = 82.3
s = 12
n1 = 42
Existing standard
method
x̅1 = 78.5
s = 9
n2 = 38
Test the hypothesis that the web casting methods of teaching social sciences subjects is
more effective than the existing standard method of teaching. Use α = 0.05.
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