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A large sample of people, each overweight, volunteered to go on the same diet and showed that the average weight loss was mean of 32.5 pounds with sample standard deviation of 8.6 pound. Find an interval centered on the mean in which we can expect at least 85% of the data to fall.
A professor of math refutes the claim that the average student spends 3 hours studying for the midterm exam. Which hypothesis is used to test the claim?
In comparing the two variances below, what is the test value and what are the degrees of freedom that should be used?
A random sample of 70 printers discovered that 20 of them were being used in small businesses. Find the 99% limit for the population proportion of printers that are used in small businesses.
A random sample of 100 students who took a statistics exam were asked their score on the exam. The mean score on the test was 50; the standard deviation was 10. The scores are normally distributed.
Find the probability that both light bulbs failed the test. Find the probability that both light bulbs passed the test. find the probability that at least one light bulb failed the test.
suppose that the probability is .3 that any given citrus tree will show measurable damage when the temperature falls to
it is estimated that 10 percent of those taking the quantitative methods portion of the cpa examination fail that
six 9 volt batteries are put on accelerated test until they fail. the variable recorded is hours of continuous use.
the owners of a two-person business make their decisions independently of each other and then compare their decisions.
A statistics practitioner conducted a two-factor analysis of variance experiment with a =4, b = 3, and r = 8. The sum of squares are listed here:
Identify three discrete variables that appear in your current or future career. How do those variables affect your workplace, your product, or your personnel? How would changes in those variables affect these things?
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.
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