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Dr. Jones has created a new drug that she believes raises intelligence.To test the drug's effect, she randomly selects 15 rats and tests their learning ability in a maze after they have been injected with the drug. Prior studies indicated that the mean time to complete the maze is 90 seconds. The times to complete the maze for Dr. Jones's subjects are: 95, 84, 80, 92, 90, 75, 100, 88, 94, 82, 78, 94, 86, 85, 83.What can Dr. Jones conclude? Use a one-tailed test at the .05 significance level.
Perform a dependent t test to assess your hypotheses above (note that many versions of SPSS use the term "paired samples t test" rather than "dependent t test"; the test itself is the same.
A candidate must gather at least 8,000 valid signatures on a petition before the deadline in order to run in an election. One candidate turns in 10,000 signatures right before the deadline
Records show that 13% of all college students are foreign students who also smoke. It is also known that 25% of all foreign college students smoke. What percent of the students at this university are foreign?
(a) What is the probability that the claim will be rejected when the cure probability is, in fact 0.8? (b) What is the probability that the claim will be accepted by the government when the cure probability is as low as 0.7?
In part b, sample have greater variability than part a, but sample sizes are unchanged. How does larger variability influence size of standard error for sample mean?
Obtain a map of your state that shows the county boundaries. Your job is to show the geography department how to select a random sample of counties for purposes of studying land use.
Calculate the probability that a blanket will contain 2 or more defects.
Find the probability that at most 5 defective bolts will be found in a box of 200 bolts if it is known that 2 per cent of such bolts are expected to be defective.
If we know that the length of time it takes an MBA student to find a parking spot near the DePaul Center follows a normal distribution with a mean of 3.5 minutes and a standard deviation of 1 minute, find the probability that a randomly selected MBA ..
the drunken professor has a class of 34 students. he wants to divide them into seventeen pairs of partners for a
Obtain a 95% prediction interval for x = 92 and interpret its meaning.
It is suspected that a random variable has a normal distribution with a mean of 6 and a standard deviation of 0.5. After observing several hundred values, we find that the mean is approximately equal to 6 and the standard deviation is close to 0.5..
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