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Explain the difference between a treatment group and control group. Be specific and thorough, (a couple paragraphs should be fine) are these included in experimental, observational studies, or both?
The distribution of hits/9-innings is approximately normal with mean 8.72 and standard deviation 1.10. Demonstrate, statistically, why a no-hitter is considered an extremely rare occurrence in MLB.
Test the teachers hypothesis that there is a significant difference between the pre and post tests.
We want to know if his support has decreased. In computing a test of hypothesis with , what is the estimate of the overall proportion?
At the 0.05 level of significance, test whether the software package has reduced the average time it takes to complete deliveries.
While 60 of the children's books are nonfiction. If a book is selected at random, find the probability of selecting the following not a children's nonfiction.
Duplicate readings, using two separate instruments, were obtained on ten samples. What is the tabular value of the statistic used to determine the significance of the mean difference at the .05 level of probability?
Make use of Excel to determine the right-tail p-value.
A study was conducted of the annual incomes of beginning probation officers in metropolitan areas of less than 100,000 population and in metropolitan areas having more than 500,000 population.
College Athletics: Graduation Rate. Women Athletes at the University of Colorado Boulder have a long term graduation rate of 67%. Over the past several years, a random sample of 38 women athletes at the school showed that 21 eventually graduated.
The summation sign is usually represented by:
There're several measures of central tendency. By far the most frequently utilized of these measures is mean of population. Remember that the source of the data that you want to analyze always comes from what is called a population.
The average public elementary school has 450 students. assume the stand deviation of the distribution is 99. if a random sample of 36 public elementary schools is selected, find the probability that the number of students enrolled is between 445 a..
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