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Course 35847
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The world's tea producers have in recent months planned and begun to implement a major advertising campaign in Europe to get people to drink more tea. The monthly figures for their tea imports into Europe (in thousands of pounds) between February and May 2020 are as follows:2, 2, 3, 3.Estimate the linear trend equation and give the value of the intercept.Show the result with one decimal place (like 2.6).
A local newspaper's readership figures (in thousands) between 2015 and 2019 are as follows: 7, 15, 9, 24, 9. Determine the index value i 2/5 . Show the result with one decimal place and use a period (.) as the separator (like 100.6).
A local newspaper's readership figures (in thousands) between 2015 and 2019 have been registered. The following linear trend equation has been estimated: \hat{y}_{t} = 59 - 1t. Forecast the number of readers for 2020. Round the result to an integer (whole number, like 4).
They also found the standard error of estimate equal to 2.5
It means that:
Run a regression of profits (Y) against revenues (X1) and number of employees (X2) for the airline industry using the data in the following table:
|
|
| |||
|---|---|---|---|---|---|
| 9 | 11 | 84 | |||
| 9 | 16 | 84 | |||
| 10 | 19 | 86 | |||
| 12 | 26 | 87 | |||
| 14 | 35 | 89 |
The President of the ABC Manufacturing Co. believes that the amount of electrical power used in his plant depends on the outside temperature during the day, and the number of units produced that day.A random sample of 5 days was selected.The power usage (Y, in thousands of kilowatt hours of electricity), the production on that date (X1, in thousands of units), and the temperature (X2, in °F) have been recorded:
|
|
| |||
|---|---|---|---|---|---|
| 5 | 21 | 71 | |||
| 7 | 27 | 74 | |||
| 10 | 35 | 78 | |||
| 10 | 45 | 79 | |||
| 11 | 49 | 82 |
According to basic economics as the price of a product decreases, the demand for it will increase.Listed below is the number of units demanded (Y variable, in thousands) and the price (X variable, in $):
| Price (in $) | Demand (in thousands of units) |
|---|---|
| 2 | 19 |
| 3 | 18 |
| 6 | 18 |
| 9 | 15 |
| 11 | 12 |
The economists want to analyze the relationship between outside temperature and heating cost. During one week in March they measured the average daily temperature X and the amount of money required daily to purchase the fuel needed to heat a two-bedroom house (Y). The results are as follows:
| Celsius temperature | Cost of fuel to heat the house ($) |
|---|---|
| 3 | 16 |
| 4 | 16 |
| 8 | 16 |
| 8 | 14 |
| 10 | 10 |
The economists want to analyze the relationship between outside temperature and heating cost. During one week in March they measured the average daily temperature X and the amount of money required daily to purchase the fuel needed to heat a two-bedroom house (Y). The results are as follows:
| Celsius temperature | Cost of fuel to heat the house ($) |
|---|---|
| 1 | 18 |
| 3 | 17 |
| 4 | 17 |
| 4 | 15 |
| 6 | 13 |