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A hypothesis states a difference exists between two populations. Sometimes this is an obvious conclusion because the means will be very different. For example, if I gave a math tests to boys and girls and the boys on average scored 20 points better than the girls, I know that is enough of a difference to conclude with accuracy that boys are in fact better in math than girls. And I know that a mere 1 or 2 point difference is not enough of a difference to conclude that boys or girls are better. But what if the difference is 5 or 10 points - is that enough of a difference? Now it is not so obvious = and that's why we need to do the t-test.
Can someone give me an example of when you thought something mattered - that it made a difference, but later you were surprised to learn that what you thought mattered, did not. Or an example of time when something did not matter, when in fact, all along it did. Thanks for sharing.
Find the mean and standard deviation for the number of left-handed students in such classes of 25 students.
Consider the relationship between yearly wine consumption (litres of alcohol from drinking wine per person) and yearly deaths from heart disease (deaths per 100,000 people) in 19 developed countries.
An airline estimates that 98% of people booked on their flights actually show up. If the airline books 76 people on a flight for which the maximum number is 74
Find out the marginal probability density function for the provided value. Assume that two random variables, X and Y, have bivariate pdf given by:
Assume the population standard deviations are not the same. At the .05 significance level, is there a difference in the mean waiting time?
A study published in the New England Journal of Medicine (Aug. 2001) suggests that it's dangerous to enter a hospital on a weekend. During a 10-year period, researchers tracked over 4 million emergency admissions to hospitals in Ontario, Canada. T..
Professor wishes to determine whether prior statistical knowledge assists students in their performance on the final exam. What is the relationship between pretest scores and final exam scores after controlling for cumulative GPA. What SPSS test w..
Computing the mean value for the given data - What is the new mean for the class and frequency distribution graph, what type of graph should be used
A biologist has found that the average weight of 12 randomly selected adult mud turtles is 8.7 lb. with standard deviation 3.6 lbs. Construct a 99% confidence interval for the population mean weight of adult mud turtles.
Briefly describe co relational research. Name a variable from this study and one from the workplace that might prove to provide a co relational relationship
The company statistician has reported the mean number of man-hours lost per month but did not keep a record of the total sum. Should the manager order the study repeated to obtain the desired information? Explain your answer clearly.
A firm plans to hire 100 employees during the year. It expects that 25 of these employees will obtain graduate degrees within the next 5 years of being hired. In addition, 35 employees will leave the firm within 5 years.
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