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Two groups of guinea pigs were injected, respectively, with 0.5 and 1.0 milligrams of a tranquilizer, and the following are the numbers of seconds it took them to fall asleep:
0.5 mg dose: 8.2 10.0 10.2 13.7 14.01.0 mg dose: 9.7 13.1 11.0 7.5 13.3
Use Wilcoxon rank-sum test to test at the .10 level of significance to test the claim that the difference in dosage have significant effect on the length of time it takes guinea pigs to fall asleep.
(a) Set up hypotheses. : :(b) Find the observed value. Utilize the table below if you like.(c) State the rejection region.(d) State your conclusion and the reason.(e) Interpret the conclusion in part (d).
Compare the margin of error for the interval estimates in parts (a), (b), and (c). The margin of error (Increases or Decreases) as p-bar gets smaller.
Find the area under the normal distribution curve to the right of z = -1.03.
If a single test is run and indicates that oil is present, what is the revised probability that oil is actually present?
Marie claims she can predict the sex of pregnant women's babies for first-time new mothers. She sees 1000 women a year, and she always predicts a female. She charges $1000 for a prediction
NBC TV news, in a segment on the price of gasoline, reported last evening that the mean price nationwide is $1.50 per gallon for self-serve regular unleaded.
An airline has surveyed a simple random sample of air travelers to find out whether they would be interested in paying a higher fare in order to have access to e-mail during their flight.
A company that produces an expensive stereo component is considering offering a warranty on the component. Suppose the population of lifetimes of the components is a normal distribution with mean of 84 months and standard deviation of 10 months.
Find a 95% confidence interval for the population mean selling price of all homes in this neighborhood.
A behavioral research situation that could use a Pearson coefficient research study and a chi square research study. Present the rationale for each selection.
Which is the probability of that the median of the sample or average medians be between 320 and 350 minutes?
The industry standard suggests that 10% of new vehicles require warranty service within the first year. Jones Nissan in Sumter, South California, sold 12 Nissans yesterday. What is the probability that none of these vehicles require warranty servic..
In a survey on the quality of customer service at Car Toys, customers were asked to rate the service on a scale from 1 to 10, with 10 being that a customer was completely satisfied.
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