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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
Solve by completing the square: Solve using the square root property:
a nonprofit company concerned with the school dropout rates in a nearby stats has designed a tutoring program at
Give an understanding with the difference between a population, a sample, and a sampling distribution. Uus a Java applet and external web sites for comment/reference.
the following data lists the average monthly snowfall for january in 15 cities around the us38 0 47 32 42 31 40 47 35
A bookcase contains 3 statistics books and 4 biology books. If 2 books are chosen at random, find the chance that both are statistics books.
We suspect that the average fasting blood sugar level of Mexican Americans is 108. A random sample of 225 clinic patients (all Mexican American) yields a mean blood sugar level of 119 (S2 = 100). Test the hypothesis that µ. = 108. What is the ..
Determine whether each of the following is an experiment or an observational study. Also identify the explanatory and response variables.
Test the hypothesis that the median ?uoride level for this city is 0.90 against the alternative that the median is different from 0.9 at α = 0.01, using (a) the large sample sign test, and (b) the Wilcoxon signed rank test. Interpret the results.
What method is best suited for such a survey? Draw the sample using the random number table and bring out the rationale of the procedure.
Calculate p-value of F test for Given Dataset
Conduct a global test of hypothesis to determine whether any of the regression coefficients are not zero. Use the .05 significance level
In testing for the equality of two population variances, when the populations are normally distributed, the10% level of significance has been used. To determine the rejection region, it will be necessary to refer tothe F table corresponding to an upp..
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