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Whirltag claims that the useful lifetime of its dishwashers is normally distributed with a mean of 3 years and a standard deviation 1 year. Consumer Rejects magazine tested 25 of these dishwashers and found that the average useful life was only 2.5 years. Using Whirltag's reported 1-year standard deviation, what is Consumer Reject's 95 percent confidence interval for the average lifetime of Whirltag dishwashers?
A random sample of 50 households revealed a mean of $112,000 and a standard deviation of $40,000. What is the standard error of the mean?
For binomial distribution among given values for n as well as p state whereas or not it is suitable to use normal distribution as an approximation.
Based on the scatter diagram, does there appear to be any relationship between the number of assemblers and production? Explain.
Show the graph of the probability density function for flight time.
Let X be the number of yes votes obtained from a random sample of 200 out of the entire voting population. What is the expected value of X if, in fact, 65% of all voters supported the dictator?
Test the overall significance of the regression model at α = .05 level. Please use the six-step hypothesis-testing framework we employed in class, and write out the last three steps in this table:
In the accompanying table, the random variable x represents the number of televisions in a household in a certain country. Determine whether or not the table is probability distribution. If it is a probability distribution, find its mean and stand..
Calculate the coefficient of skewness and coefficient of variation of minutes spent commuting. What do these statistics tell us?
A manager of a large department store with three floors reports that the time a customer on the second floor must wait for an elevator has a uniform distribution ranging from 0 to 16 minutes. It takes the elevator 1 minute to go from floor to floo..
Find a 95% confidence interval for the percentage of girls and women in Taiwan who had antibodies at that time.
Formulate the hypotheses to test to see if the mean of the population is at least 12 ounces.
A. What is the 90% confidence interval for the daily sales at all restaurants. B. What is the probability that the average sales are really $32,000 or more per day? Assume that the population average is $30,000 per day and the std. Deviation is $2..
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