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Question: An advertisement is being tested to see if it is effective in creating the intended mood of relaxation. A sample of 15 people was tested just before and just after viewing the ad. Their questionnaire included many items, but the one being considered now is: Please describe your current feelings on a scale from 1 (very tense) to 5 (completely relaxed). The results are shown in Table 16.4.3.
a. How many people reported higher relaxation after viewing the ad than before? How many reported lower relaxation? How many were unchanged?
b. Find the modified sample size.
c. Perform the nonparametric sign test for the differences.
d. Briefly summarize this result in terms of the effect (if any) of the advertisement.
If the standard deviation of the differences was 0.5, find a 95% confidence interval for the difference. Assume the distribution of GPA's is approximately normal.
Suppose that you throw a dice 2 consecutive times and that you have to make a probabilities chart that show all the possible results of the 2 throws. How many branches will result?
What examples of progress could leaders like W.E.B Du Bois, James Weldon Johnson, A.Philip Randolph, and Marcus Garvey point to in the 1920s?
Calculate the breakeven point in sales dollars using the contribution margin ratio approach. How many pizzas must be sold to earn $60,000 profit per annum before tax?
Problem: Screening for infectious diseases in a blood-bank setting is a major part of ensuring blood safely. At a local clinic, subject's blood donations are tested for infection. Suppose that 5 percent of all blood donations are infected n some w..
Develop an appropriate forecast model for the given problem whereas the student population has remained constant during this period.
A zero-mean Gaussian random signal has the autocorrelation function of the form γX(τ) = 10e-0.1|τ| cos 2πτ. Write the covariance matrix for the signal sampled at four time instants separated by 0.5 seconds.
a car commercial advertises that a certain brand of car averaged at least 33 miles per gallon of gasoline. to verify
A silver dollar is flipped 100times, with the following results: Heads =57, tails=43. What test should be used to determine if this is a fair coin?
a. Specify the competing hypotheses that determine whether the median differs from 100.
a machine produces 1000 rubber 0rings per hour. each ring has a .9 probability of meeting a thickness specification.a
An economist is interested in studying the incomes of consumers in a particular region. The population standard deviation is know to be $1,000. A random sample of 50 individuals resulted in an average income of $15,000.
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