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The probability of a California teenager owning a surfboard is 0.43, of owning a skateboard is 0.38, and of owning both is 0.28. If a California teenager is selected at random, find the probability that he or she owns a surfboard or a skateboard.
What are the assumptions of a correlated-groups t-test? What measure of effect size is used for a correlated groups t-test?
What is the probability that a respondent said neither the Big Ten nor the Pac-10 will have a team in the Rose Bowl?
a group of researchers want to test their hypothesis that sleep deprivation will decrease the number of lectures
Urn3 contains 4purple balls and 5red balls. If one of the urns is selected at random and a ball is drawn, what is the probability it will be purple.
Four customers in succession come into the store to order stereos. The retailer is interested in their preferences. List the possibilities for preference arrangements among the four customers.
A six-sided die is rolled 30 times and the numbers 1 through 6 appear as shown in the following frequency distribution. At the .10 significance level, can we conclude that the die is fair?
What is the probability that at least 40 of the firefighters will be volunteers in both groups
t* A researcher collects a sample of 25 measurements from a population and wants to find a 99% confidence interval.
Create a 90% confidence interval for mean score on this placement exam for all students.
to evaluate a particular metlar scale an item whose weight is known to be 16.01 ounces is weighted five times by the
Likewise, the variance of the demand for the entire three week period is the sum of the individual weekly variances. But be careful! The standard deviation of the demand for the entire 3 week period is not the sum of the individual standard deviat..
Show that maximizing expression (Eq. 8.37) yields the normal equations (Eq. 8.38),
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