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In a study, 32 adults with mild periodontal disease are assessed before and 6 months after implementation of a dental education program intended to promote better health oral hygiene. After 6 months, periodontal status improved in 19 patients, declined in 8, and remained the same in 5. Assess the impact of the program statistically. Use a two-sided test and let alpha = 0.05.
Create a practice data file that contains the following variables and values: Compute the mean and standard deviation and variance and print out on a single page
In a sequence of n independent fair coin tosses, what is the expected number of occurrences of the pattern HTH (consecutively)?
best sleep and furniture company wishes to study the number of credit applications received per day. the information is
Gerstein (1965) studied the long-term pollution of Lake Michigan and its effect on the water supply for the city of Chicago. One of the measurements considered by Gerstein was the annual number of "odor periods" over the period of years 1950-1964...
A human resource manager is interested in whether absences occur during the week with equal frequency. The manager took a random sample
Lengths had a calculated sample standard deviation of 8 and mean of 9.4. Select the 95% confidence for the true variance of the product lengths. Use the appropriate table in the book.
Suppose that a coin is tossed 3000 times and 1800 heads result. What is the empirical probability that a head will occur with this coin? Is there evidence.
The time in minutes until the paint was dry enough for a second coat to be applied was recorded. The following data were obtained. Test to see whether the mean drying time is the same for each type of paint.
Exercise 4.20 (page 168) asks the question "Will you live longer if you use the Internet?" Figure 4.9 (page 168)
If the null hypothesis is that the drug does not help patients with Parkinson's then the preliminary trial apparently committed which type of error
We select 60 people at random. Is it reasonable to use a Normal model to describe the possible distribution of the proportion of the group that has left-brain.
If a freshman takes one course in each area during her first semester, how many course selections are possible?
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