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Chocolate bars produced by a certain machine are labeled with 8.0 oz. The distribution of the actual weights of these chocolate bars is Normal with a mean of 8.1 oz and a standard deviation of 0.1 oz. A chocolate bar is considered underweight if it weighs less than 8.0 oz. What proportion of chocolate bars weighs less than 8.0 oz?
The Complaints Department of a popular used car dealer receives most complaints about the electrical system, particularly the starter.
Cash withdrawals (in multiples of $20) at an on-campus ATM for a random sample of 30 Fridays and 30 Mondays are shown below.
People with MBAs often get promoted faster than people without the degree. Prepare a 92% confidence interval estimate for the population proportion.
Construct three scatter plots for: (1) percentage alcohol versus calories, (2) percentage alcohol verses carbobydrates, and (3) calories versus carbohydrates
Ppaid full salary for the current year. a. Determine how to minimize the bus company's salary, hiring, and firing costs over the next 5 years.
It falls into the region of alternative is accepted greater than .95
Find the minimum sample size required for estimating the overall proportion of students who passed Exam P in 2009 to within 4% with 95% confidence if it is known that this proportion is between 30% and 40%.
State a type I error and describe why it happens. Describe the factor that researcher can control to change type I error. Also, describe how type I errors can be avoided.
Find out point estimate and 95% confidence interval for mean family dental expenses of all employees of company.
Sketch the distributions involved, and (c) explain your answers to someone who has never had a course in statistics.
Formulate the hypotheses to test to see if the mean of the population is at least 12 ounces.
A human society claims that less than 36% of US. households own a dog. In random sample of 397 U. S. households, 151 say they own a dog. At mean=0.03, is there enough evidence to support the society's claim?
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