Reference no: EM1396782
Exercise 1
Calculate a four-quarter weighted moving average for the number of America Online (AOL) subscribers for the nine quarters of data. The data are reported in thousands. Apply weights of .1, .2, .3 and .4, respectively, for the quarters. In a few words, describe the trend in the number of subscribers.
31-Mar-01 28,766
30-Jun-01 30,057
30-Sep-01 31,336
31-Dec-01 33, 240
31-Mar-02 34,610
30-Jun-02 35,102
30-Sep-02 35,308
31-Dec-02 35,203
31-Mar-03 34,386
Part II
1. Define:
Statistics
Hypothesis
Parameter
2. In a particular market there are three commercial television stations, each with its own evening news program from 6:00 to 6:30 P.M. According to a report in this morning's local newspaper, a random sample of 150 viewers last night revealed 53 watched the news on WNAE (channel 5), 64 watched on WRRN (channel 11), and 33 on WSPD (channel 13). At the .05 significance level, is there a difference in the proportion of viewers watching the three channels?
3. A rental company charges $30 a day and 15 cents per mile for renting a car. Let y be the total charges (in dollars) for a car for one day and x be the miles driven. The equation for the relationship between x and y is:
Y = 30 + .15X
How much will a person pay who rents a car one day and drives it 100 miles?
Suppose each of 20 persons rents a car from this agency for one day and drives it 100 miles. Will each of them pay the same amount for renting a car for a day or is each person expected to pay a different amount? Explain.
Is the relationship between X and Y exact or nonexact?
Identify the dependent and independent variables.
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: Calculate a four-quarter weighted moving average for the number of America Online (AOL) subscribers for the nine quarters of data. The data are reported in thousands.
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