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Forty subjects are randomly assigned to receive either a new memory pill or a placebo. After treatment, they are all given a difficult recall test. The mean for the memory-pill group is 82%, whereas that for the placebo group is 64%. Can we conclude that the memory pill worked? Explain.
A wine taster claims that she can distinguish four vintages of a particular Cabernet. What is the probability that she can do this by merely guessing?
A population is composed of 100 items arranged in some order. Every stratum of 10 items in the order of arrangement tends to be similar in its values.
Construct a 95% confidence interval estimate of the difference between the percentage of men and the percentage of women who fear flying.
A researcher administers a treatment to a sample of n = 25 participants and uses a hypothesis test to evaluate the effect of the treatment.
a random sample of six cars from a particular model has the following fuel consumption figure in miles per gallon 18 16
A random variable X has the following probability distribution:- Calculate the mean of X.- Calculate the variance of X.- Calculate the standard deviation of X.
Of the items produced daily by a factory, 40% come from line I and 60% from line II. Line I has a defect rate of 8%, whereas line II has a defect rate of 10%. If an item is chosen at random from the day's production, find the probability that it ..
Find the conditional probability of reading Industrial Chemistry given that they have bought your products.
The population standard deviation for both groups is 6. At α = 0.01, is there a difference in the cholesterol levels between the two groups? Find the 99% confidence interval for the difference of the two means.
question an electronics company wants to compare the quality of their cell phones to the cell phones from three
A fireworks show is designed so that the time between fireworks is between one and five seconds, and follows a uniform distribution. a. Find the average time between fireworks.
Using the confidence interval method, test the claim that the average age of consumers is at least 30 years ( α= 0.05). Test the same claim by using the test statistics method ( Z or T test).
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