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1. The manager of a tire store in Minneapolis has been concerned with the high cost of inventory. The current policy is to stock all the snow tires that are predicted to sell over the entire winter at the beginning of the season (end of October). The manager can reduce inventory costs by having suppliers deliver snow tires regularly from October to February. However, he needs to be able to predict weekly sales to avoid stockouts that will ultimately lose sales. To help develop a forecasting model, he records the number of snow tires sold weekly during the last winter and the amount of snowfall (in inches) in each week.
a. Develop a regression model and use a software package to produce the statistics.
b. Perform a complete diagnostic analysis to determine whether the required conditions are satisfied.
c. If one or more conditions are unsatisfied, attempt to remedy the problem.
d. Use whatever procedures you wish to assess how well the new model fits the data.
e. Interpret and test each of the coefficients.
2. Plot the following time series to determine which of the trend models appears to fit better.
Period
1
2
3
4
5
6
7
8
9
10
Time Series
55
57
53
49
47
39
41
33
28
20
Is it harder to get into graduate programs in psychology or history? We randomly selected five institutions from among all U.S. institutions with graduate programs.
The subjects are asked their opinions about sex and marriage, attitudes toward women, welfare, foreign policy and many other issues. The implied population is All Americans.
1.we are interested in comparing the proportions of males and females who think earning a large salary is very
Find the sample mean and sample standard deviation of the amount citizens spend per year. When finding a confidence interval for the true mean spent of ALL citizens, should we use a z-score or a t-score? Why?
give an example of how you may use a correlation or simple regression to examine the relationship between two variables
Use SPSS to make a scatterplot between stress and coping, and then add the fitted regression line to the plot. Mark both intercept and slope on the plot (You may consider to change the default X scale in SPSS)
Chi-square test for goodness of fit - difference in the use of the four entrances?
Any state auto insurance company took a random sample of 370 insurance claims paid out during a 1-year period. the average claim was $750 with a standard deviation of $150. find .99 confidence interval for the mean claim payment.
find the range and the standard deviation correct to two decimal places. 83 96 99 99
Angela works as a quality supervisor. She has uncovered a quality issue with safety brackets on baby swings. Angela determines that 21% of the safety brackets are out of spec.
sports fans tune to a local sports talk radio station according to a poisson process with the rate of three fans every
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