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Question:
(a) Suppose that 100 tires made by Bridgestone last on average 21,819 miles with a standard deviation of 1,295 miles. Test the null hypothesis µ = 22, 000 miles against the alternative hypothesis µ < 22, 000 miles at the 5% level of con?dence.
(b) It is decided that H0 is rejected if the sample mean is less than 21,819. Using the same information in part (a) above, except for the 5% level of con?dence, calculate
(i) P(H0 is accepted | H1 is true with µ = 21, 500).(ii) the power of the test.
(c) The results of 100 students who have taken part in examinations on Probability and Statistics during the past few years can be summarised as follows. Out of 42 males, 30 have passed and out of 58 females, only 34 have passed. Test at the 5% signi?cance level whether there is a relationship between gender and success in modules of Probability and Statistics.
It is known that the average height of a man residing in the Canada is 174 cm and the standard deviation is 8 cm. Assume the heights are normally distributed. To test the hypothesi
The initial research proposal will consist of the following SIX (6) items: 1. Identify a business research topic 2. Define the research questions for the identified problem or opp
Suppose we wanted to compare the somatic complaints (as measured on a scale known as the Physical Symptom Survey or PSS) of three groups of people; nonsmokers, smokers, and people
Foster Company makes 20,000 units per year of a part it uses in the products it manufactures. The unit product cost of this part is computed as follows: Direct materials $24.70 Dir
1) Define and explain the following: i) Ordering cost ii) Safety stock iii) Re-order point 2) Profit Volume Chart. 3) Discuss the various techniques of financial statement analysis
X f 150 3 400 4 300 5 200 6
explain the characteristics of statistics
Managers are very interested in how a consumer makes choice among alternatives. In this exercise, we ask you to consider the price of gasoline you may purchase to operate
1. (i) Complaints were made about the level of pollutants in the discharge from a certain factory. The factory refuted the complaints by showing the results of their own analysis
when the closing inventory is understated, the profit for the period will
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