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What are some of the concerns relating to the internal validity of a study and recommendations to strengthen it? How will the other 3 types of validity help? What are the dangers of failing to consider the validity of a research study?
a decision maker is considering including two additional variables into a regression model that has as the dependent
The random variable X is the distribution of siblings of a student selected at random from a particular secondary school. Its probability distribution is given in the table.
the following table gives the average high temperatures in january and july for several european cities. write a 90
C is sometimes called the "universal assembly language" in light of its ability to be very efficiently implemented on a wide variety of computer architectures.
pyramid lake is on the paiute indian reservation in nevada. the lake is famous for cutthroat trout. suppose a friend
the city transit authority plans to hire 12 new bus drivers. from a group of 100 qualified applicants of whom 65 are
a random sample of 16 google managers yields the following information on annual salaries. the sample mean is 69000
He randomly samples 45 oil wells throughout the United States and determines the mean output to be 10.7 barrels per day with a standard deviation of 1.3 barrels. Test the researcher's claim at the .025 level of significance.
Determine whether the LZR Racer significantly improves swimmers' times at the 5% significance level. Assume that the time difference is normally distributed. Comment on whether the data appear to support FINA's decision.
a researcher notes that the correlation in the group she studies is so large that if there were not a correlation among
You just started a job for a mid-size company. The company is very employee-oriented and likes to have employees get involved with making decisions that help improve employee well-being.
Using an appropriate probability model for the population from which the data is a random sample, obtain a precise 95% con?dence interval for the mean of this population; use this interval estimate to test the hypothesis by the Editor-in-Chief that..
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