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In team-teaching, two or more teachers lead a class. A researcher tested the use of team-teaching in mathematics education. Two of the variables measured on each teacher in a sample of 171 mathematics teachers were years of teaching experience x and reported success rate y (measured as a percentage) of team-teaching mathematics classes The correlation coefficient for the sample data was reported as r = -0.32. Interpret this result.
After polling every 8 th graduate, a major university estimated annual salary of its alumni to be $103,000. What sampling technique was used?
the distribution of the amount of money in savings accounts for university of miami students has an average of 1100
a paint manufacturer wants to determine the average drying time of new interior wall paint. if for 15 test areas of
A consumer survey indicates that the average household spends m=$155 on groceries each week. The distribution of spending amounts is normal with a standard deviation of o=$25. Based on this distribution
a researcher wants to know the average height of trees in a plot of land. the researcher randomly samples 18 trees and
200 people were surveyed and asked to rate mayor Michael Bloombergs effectiveness towards education. The rate scale is 1 (lowest) to 10 (highest). Mayor Bloomberg's average rating was 7.50, with a standard deviation of 2
Consider you have completed a survey of employees working in a call center doing customer service for a major manufacturing company.
Finding appropriate z- and t-scores is important when constructing confidence intervals. Confidence intervals allow one to estimate important population parameters such as population mean, population proportion, population standard deviation, etc. We..
Oxytocin is a naturally occurring brain chemical that is nicknamed the "love hormone" because it seems to play a role in the formation of social relationships such as mating pairs and child-parent bonding.
Twenty-five percent of the employees of a large company are minorities. A random sample of 7 employees is selected. What is the probability that the sample contains exactly 4 minorities?
Create a 90% confidence interval for the true average number of unoccupied seats per flight. interpret this interval in the context of the problem.
in an emergency the typical driver requires about 0.75 seconds to get his or her foot onto the brake. the distance that
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