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The effect of n. In given Example, consider what would have happened if you had paid for twice as many subjects to be tested. Assume that the results would be similar to those in your test-that is, 65% of the subjects had better UVA and UVB protection with your product. Perform the significance test and summarize the results.
Example Comparing two sunblock lotions. Your company produces a sunblock lotion designed to protect the skin from exposure to both UVA and UVB radiation from the sun. You hire a testing firm to compare your product with the product sold by your major competitor. The testing firm exposes skin on the backs of a sample of 20 people to UVA and UVB rays and measures the protection provided by each product.
For 13 of the subjects, your product provided better protection, while for the other 7 subjects, your competitor's product provided better protection.
1.In a recent article U.S. News and World Report rated pediatric hospitals and provided data on several characteristics, including daily inpatient volume and nurse to patient ratio, for the top 30 hospitals on its list (U.S. News and World Report, Ju..
Your bank sends you a summary statement, giving the average amount of all checks you wrote during the month.- Using this and the information provided by the bank, can you figure out the amounts of the two missing checks?
Let X be a normally distributed random variable with mean 410 and standard deviation 2. Find the probability that X will be between 407 and 415.
Construct an appropriate control chart and comment on the process assuming a type I error rate of 0.005. What would the control limits be for a type I error rate of 0.05? What factors would influence your selection of the type I error rate?
The number of UFO (Unidentified Flying Object) sightings per week in Roswell, NM is a random variable with the cumulative distribution function given below.
"Determine if the statement is a typical null hypothesis (Ho) or alternative hypothesis (Ha). The average price of a particular statistics textbook over the Internet is the same as the average price of the textbook sold at all bookstores in a coll..
an urn contains six balls of which three are red and three are green. two balls are selected from the urn. if one ball
What is the probability that a student will complete the exam in more than 60 minutes but less than 75 minutes?
What is the next test that is performed to determine specifically which of the four groups are different - what statistical test should be used?
Find the 95% confidence interval for the unknown population mean.
in 2003 approximately 0.38 of the u.s. population had hivaids. of these it was estimated that 24.8 were not aware they
Suppose that the weight (again, in units of 1,000 pounds) of a car is a random variable with mean 3 and standard deviation .3. How many cars would have to be on the bridge span for the probability of structural damage to exceed .1?
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