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1. A firm predicts it will use 560,000 gallons of water next year. If the seasonal index of water consump- tion is 135 for the second quarter of the year, what is the forecast for water consumption during that quarter?
2. The quarterly seasonal indexes for a firm's elec- tricity consumption are 115, 92, 81, and 112 for quarters I-IV. It has been forecast that electricity consumption will be 850,000 kilowatt-hours during 2014. Forecast electricity consumption for each quarter of 2014.
3. When autocorrelation of the residuals is present, what effect can this have on interval estimation and significance tests regarding the regression model involved?
4. What is the Durbin-Watson test for autocorrela- tion, and how can it be useful in evaluating the relevance autocorrelation of the residuals at the 0.05 level of signifi- cance. Comment on the appropriateness of using this model for this set of data.
t yt t yt t yt
of a given regression model that has been fitted to a set
of time series data?
1
97.0
6
125.5
11
150.6
2
109.7
7
132.9
12
157.8
18.44 The least-squares regression equation yˆ 5 98.1 1 5.0t
3
110.3
8
139.7
13
158.3
has been fitted to the shipment data given here. Calculate
4
121.5
9
145.6
14
166.9
the Durbin-Watson d statistic and test for positive
5
130.4
10
149.4
15
175.8
The weights of a random sample of cereal boxes that are supposed to weigh one pound are listed here. Estimate the variance of the entire population of cereal box weights with 90% confidence.
a random sample of 16 students from the student body of a large university had an average age of 25 years and a sample
You are the principal of a large urban high school and wish to do a parent survey to determine how parents feel about same-sex classes.
He randomly selects a sample of 10 items of the procduct from a large lot ready to be shipped. He (given that) the true proportion of perfect condition items is only 80% what is the probability that the lot will not be shipped?
the study found 87 per cent of 1500 australians surveyed would support colour-coding on packaged food to indicate
electronics manufacturer se must decide whether or not to invest in the development of a new type of battery. if the
The times for 300 college students of introductory statistics to complete a one-hour times exam.
Evaluate the research design in light of the stated research objectives - do the measurement scales used appear to be valid and reliable - Should multivariate analysis be used to understand the data?
Please see the attached file for the fully formatted problems. Convert the following equations into logarithmic form:
Below are one hundred pseudorandom numbers from a uniform pdf. Set up and test the appropriate goodness-of-fit hypothesis. Let α = 0.05.
approximately what proportion of the area under a normal curve with mean ? and standard deviation ? falls to the right
a sample of 230 observations is selected from a normal population for which the population standard deviation is known
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