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An appliance manufacturer claims to have developed a new toaster oven that consumes an average of no more than 250 W. From previous studies, it is believed that power consumption for toaster ovens is normally distributed with a variance of 324 W. A consumer group suspects the actual average is more than 250 W. They take a sample of 20 toaster ovens and calculate the average consumption to be 260 W. What is the parameter of interest in this situation? And test the consumer group's suspicion at the 5% significance level.
A manager of a small store wanted to discourage shoplifters by putting signs around the store saying "Shoplifting is a crime!" However, he wanted to make sure this would not result in customers buying less.
In a regression analysis involving 30 observations, the following estimated regression equation was obtained.
Give null and alternative hypotheses for this test in symbolic form.
What is the level of measurement for the variable, "political ideology" measured as "Very Conservative", "Conservative","Moderate", "Liberal" and "Very Liberal".
Determine percentage of employees has 5 dependents? Of all employees which have at least one dependent, determine percentage has more than one?
Drawing the standard normal curve and indicating the area representing the probability and
Develop an appropriate forecast model for the given problem whereas the student population has remained constant during this period.
A supervisor has noticed that sales for all departments world wide has been averaging $12,000 a month for a number of years. For the last 18 review periods the average sales figure has dropped to $11,500 with a standard deviation of $4,000. Manage..
Critically discuss the purpose of developing a frequency distribution? What is the relationship between the relative frequency and the cumulative frequency? Could a frequency distribution contain qualitative data? Why?
Multiple choice questions based on multiple regression - Find the coefficient of determination for the above model
A process has a capability index of 0.40. This index is interpreted to mean that the process is:
Which of following statements would be right concerning a twotail test at 0.05 level of significance? We can conclude that average cottage cheese consumption in America is at least 0.705 pound more or less than 2.75 pounds per person per year.
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