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While there is still an overwhelmingly gloomy outlook, Americans are growing more upbeat about the economy (CNNMoney.com, October 26, 2010). The following table lists a portion of the University of Michigan's Consumer Sentiment Index. This index is normalized to have a value of 100 in 1965 and is used to record changes in consumer morale. The full data set can be found on the text website, labeled Consumer Sentiment.
a. Plot and interpret the series.
b. Construct and interpret seasonal indices for the series.
c. Estimate linear, quadratic and cubic trend models to the seasonally adjusted data. Select the best fitting model.
d. Use decomposition analysis to make a forecast for November and December of 2010.
Assume the number of days it takes a homebuilder to complete a house is normally distributed with an average completion time of 176.7 days and a standard deviation of 24.8 days. Calculate the completion time that the builder has a 40% probability ..
A company is considering five possible names for its new product. Before choosing a name, the firm decides to test whether all five names are equally appealing.
Pick one of the companies listed in the National Business Aviation Association (NBAA) website (Links to an external site.) for select product and services.
Find the conditional distributions (percentages) of political views for the males.- Make a graphical display that compares the two distributions.
The Gallup Organization polls 1000 individuals to estimate the percent of American adults who approve of the President's job performance.
in a study on infants one of the characteristics measured was head circumference. the mean head circumference of 8
Give a 90% confidence interval for the difference and briefly summarize what the data show.- Use a test of significance to examine whether the two proportions are equal.
Drive time Professor Moore, who lives a few miles outside a college town, records the time he takes to drive to the college each morning.
A large tank of fish from a hatchery is being delivered to a lake. The hatchery claims that the mean length of fish in the tank is 15 inches, and the standard deviation is 2 inches. A random sample of 36 fish is taken from the tank.
the length of an injection-molded plastic case that holds magnetic tape is normally distributed with a length of 90.2
The results of a published research study indicated that babies fed on breast milk gained an average of 11 ounces per week; babies fed a powdered instant baby formula gained an average of 2 ounces per week.
You can help him determine this by calculating the following probability: What is the probability of Jim collecting a sample mean from those 50 students that is less than or equal to 48.7 gallons?
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