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A manufacturer of small electric motors used in heat pump claims that the motors average 450 hours of use before their first breakdown. A major heat pump manufacturer (the customer) has suggested to the manufacturer that their motors are performing much better than their claim. As the Engineering Intern hired by the electric motor manufacturer you have been asked to investigate whether or not the heat pump manufacturer (the customer) has a legitimate case. To address the problem, you took a sample of 64 of these motors. Your analysis showed an average of 460.5 hours of use before a breakdown, with standard deviation of 20 hours.
a) Develop a hypothesis to investigate this problem based on the claim of the heat pump manufacturer (the customer) with α= 0.01. What is your decision or recommendation at α = 0.01
b) Will your decision or recommendation change at α = 0.05?
If you have a statistical package that computes binomial probabilities, find the probability that at least five funds outperform the market in all 10 years.
Use the method of least squares to model the relationship between x and y.
At the 0.05 level of significance, is there evidence of a significant relationship between the age groups and where people primarily get their news? If so explain the relationship.
Write down the name of 4 parts of the regression equation.
One measure of the overall sampling error in the entire distribution of sample means is the
Is there a significant difference the four testing conditions?
LINEAR PROGRAMMING MODELS
The average hourly wage of employees of a certain company is $9.83. Assume the variable is normally distributed.
The random variable X has which of the following probability distributions and What is the probability that no student wins
Write the null and alternative hypotheses you would use to test the following situation.
At the .05 significance level, can we conclude that the mean waiting time is less than 3 minutes?
What is the standard deviation of expected returns for Stock X? For Stock Y?
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