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At a large local hospital 20 teen volunteers worked a total of 172 hours with a standard deviation of 3.6. thirty senior citizens volunteers worked a total of 366 hours with a standard deviation of 4.2. at a=0.01, ca a difference in means be concluded?
A state meat inspector in lowa has been given the assignment of estimating the mean net weight of packages of ground chuck labeled " 3 pounds." Of course, he realizes that the weights cannot be precisely 3 pounds.
Inverse relationship with wage spending. What should the microeconomist who developed this multiple regression model be particularly concerned with?
Credits is the number of college credits taken and Work is the number of hours worked per week at an outside job. Is the intercept meaningful? Explain.
Distributed with mean 4.6 minutes and standard deviation 1.4 minutes. If there are 75 students in class, determine probability the professor requires more than 6 hours to mark all of the midterms?
suppose we draw two tickets from a hat that contains tickets numbered 1234. let x be the 1st number drawn and y be the
at ajax spring water a half-liter bottle of soft drink is supposed to contain a mean of 520 ml. the filling process
How much money would a Western household have to spend on groceries per year in order to be at the 99th percentile?
Make a point estimate of the population mean difference in endurance after taking the herbs. Make a 95% confidence interval estimate of the population mean difference.
a spinner is divided into 4 equal spaces. a player bets 2.00 on a given space. if the spinner lands on that space he is
State the null and alternative hypothesis. population standard deviation is $2500 and level of test is 0.05 what is the critical value?
Find the mean number of radioactive atoms lost through decay in a day. Find the probability that on a given day, 50 radioactive atoms decayed.
A sample of n observations is taken from a population. When performing statistical inference about a population variance, the appropriate chi-square distribution has:
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