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An inspector correctly identifies defective products 90% of the time. For the next 10 products, the probability that he makes fewer than 2 incorrect inspections is 0.736.
Transmission is normally distributed with an average of 78,000 miles and a standard deviation of 15,000 miles. What percentage of these transmissions will last at least 90,000 miles?
Construct a 99% confidence interval estimate for the population mean weight of the tea bags. Is the company meeting the requirement set fourth on the label that the mean of tea in a bag is 5.5 grams?
Describe what you find then produce an ANOVA for the problem.
The annual salaries for Americans are normally distributed with a standard deviation equal to $7,500. Find the following:What percentage of Americans earn below $20,000?
Do these scores suggest that the different foods are differentially preferred by people in general? (Use the .05 significance level.)
Suppose population standard deviation for those drinking regular coffee is 1.20 cups per day and 1.36 cups per day for those drinking decaffeinated coffee.
Carry out the suitable hypothesis test, at alpha = .05, to find out whether there is a relationship between school/work and stress.
What is the null hypothesis? Use a = 0.05 .
A neurologist wants to detect whether the mean response time for drug-injected rats differs from a control group not injected. The control group has the mean response time of 1.2 seconds.
What proportion of the adult men in United States are more than feet tall? (Hint: feet inches.) Round your answer to at least four decimal places.
Suppose investigators are interested in a population of patients who have been recently diagnosed with a particular kind of colon cancer (nonpolypoid colorectal neoplasm).
you are testing whether there is a significant difference in the proportions of college students and similar aged non college students having accidents during the two year period. Is this a one sample or two sample test?
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