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A manufacturer of microwaves gathers information on microwave sales from a random sample of 50 stores in a large retail chain. In the sample, the mean number of microwaves sold per store last week was 19 with standard deviation 2. What is the 95% confidence interval for the mean number of microwaves sold at retail store in the chain last week?
In a sample survey, 200 of 800 individuals enrolled in our managed-care organization indicated that they favored a proposal to extend office hours from 5:00 to 8:00 p.m. Construct a 95% confidence interval for the corresponding true proportion.
A Patent Medicine Company supervisor assumes that the bottling machine is operating properly if only 5 percent of the processed bottles are not full. A random sample of 100 bottles had 7 bottles that weren't full. Using a significance level of .01..
If you are told a population has a mean of 25 and a variance of 0, what must you conclude? a) Someone has made a mistake. b) There is only one element in the population.
Due to large losses incurred in the past several years, a firm has $2 billion in tax-loss carryforwards. This means that the next $2 billion of the firm's income will be free from corporate income taxes.
A corporation owns a factory that produces sulfuric acid. Because of changing conditions, the plant's output is quite variable. The company's president has observed that the output is normally distributed with a mean of 8,200 pieces per hour.
For a new HDTV the mean number of months until repairs are needed is 36.84 with a standard deviation of 3.34 months.
A machine that manufactures automobile parts is estimated to produce defective parts 5% of the time. If this estimate is correct, and 9 parts produced by this machine are randomly selected
A random sample of 400 college students was selected and 120 of them had at least one motor vehicle accident in the previous two years. A random sample of 600 young adults not enrolled in college was selected and 150 of them had at least one motor..
A statistician wants to estimate the mean weekly family expenditure on clothes. He believes that the standard deviation of the weekly expenditure is $125.
Construction of frequency distribution table for the given continuous data.
An automobile manufacturer advertises that the mean petrol consumption of its new hybrid car does not exceed 4.6 litres per 100 km. An independent company decides to test the manufacturer's claim by selecting a random sample of 16 vehicles and mea..
Internal study by Technology Services department at Lahey Electronics disclosed company employees get the average of 2 emails per hour. Suppose arrival of these emails is approximated by Poisson distribution.
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