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Suppose for Problem 12 that the director's purpose in carrying out the recent study was c12.qxd 6/to check on the effectiveness of an antismoking campaign at the university, instituted shortly after the completed survey of 2 years ago.
(a) Set up H0 and HA.
(b) Perform the statistical test (.05).
(c) Draw final conclusions.
(d) Compare your conclusions with those from Problem 12.What does this suggest about which is more likely to give significant results: a two-tailed test or a one-tailed test (provided the direction specified in HA is correct)?
Frank has a 66% chance of receiving an A grade in statistics, a 60% chance of receiving an A grade in mathematics, and a 77% chance of receiving an A grade in statistics or mathematics (or both).
The NAEP test was also given to a sample of 1077 women of ages 21 to 25 years. Their mean quantitative score was 275. Take it as known that the standard deviation of all individual scores is = 60.
You have a graph with a regression line that is positively sloped. The regression line starts with observation points tightly packed around the regression line but as you move across the x-axis the observations tend to get further and further away..
an ice cream store offers 18 different ice cream flavors and 6 different toppings. you are able to order one or two
Why did so many Americans from so many walks of life come to dislike and oppose the Vietnam War? (Give at least two reasons)
Find a 95% confidence interval for the population variance in caster angle. Assume normality.- Is there any evidence to suggest the population variance in caster angle is different from 0.40?
A student stated that the first-order autoregressive error models ( 12.1 ) and (12.2) are too simple' for business time series data because the error term in period t in such data is also influenced by random effects that occurred more than on..
Find the 2σ and 3σ control limits for the average delivery time.- Explain a type I and type II error specifically in this context.
a game consists of flipping a coin repeatedly until two heads or two tails are obtained. assume that flips are
according to a study by the centers for disease control and prevention about 33 of u.s. births are caesarean deliveries
Describe the five steps of hypothesis testing. Compare Type I and Type II errors and give specific examples for each. Which error should be minimized the most and first?
For this same sample of n = 45, find out the width of confidence interval around population mean? Illustrate all work.
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