(5) Explain in plain language what the slope and the intercept mean respectively in this example.

(6) The R square value is 0.7264, please explain what it means in plain language.

(7) Based on the regression equation given, how many cigarettes would you expect someone to smoke in an average week if they have 4 friends who smoke? Show your calculations and round to a whole number.

(8) Can you also make a prediction for someone with 15 friends that smoke?

(9) Based on the results of the regression analysis, what could be the health implications to people who smoke?

3. You can find a Consumer Price Index (CPI) table of a fictional country 'Ostania' below, and answer the following two questions:(8%) | Year | 2018 | 2019 | 2020 | 2021 | 2022 | | --- | --- | --- | --- | --- | --- | | CPI | 101.3 | 102.1 | 108.5 | 114.2 | 120.4 | (1) Compared to 2020, how much more expensive are consumer goods and services in 2022 in Ostania? Calculate your answer in percentages and round to 2 decimals.

(2) Mr Loid Forger has been living in Ostania since 2020 and has earned €4250 net per month in 2020. In 2022 his salary was €4650 net per month. Has Mr Forger's salary, when adjusted for inflation, increased or decreased in 2022 compare to 2020? By what percentage? Show your calculations! (round to 2 decimals).

4. A metaverse company analyzes the sales situation in 111 years, and determines the relationship between the payment method and the price category of consumers to purchase metaverse goods, and obtains the following joint probability table. | Item | cash | credit card | debit card | | --- | --- | --- | --- | | Below 10,000 yuan | 0.09 | 0.03 | 0.04 | | 10,000--100,000 yuan | 0.05 | 0.21 | 0.18 | | More than 100,000 yuan | 0.03 | 0.23 | 0.14 | Please answer: (15 %) (1) What is the proportion of consumer payments made by using debit cards?

(2) What is the probability that consumers will spend more than 100,000 yuan when they use a credit card to pay for a transaction?

(3) What is the proportion of purchases paid by consumers using credit or debit cards for financial transactions?

5. Assuming that the operating income of the head office and branches of the international business is in line with the binary normal distribution, the operating income of the international business head office in 111 year is subject to the normal distribution of the mean value is 170 and the standard deviation is 10. The operating income of the branch is subject to the normal distribution of mean value is 170 and the variance is 10. The correlation coefficient between these two is 0.6. Today, considering a group of international businesses with a total operating income of 175. Please answer: (10 %) (1) What is the average operating income of its branches?

115年 - 115 國立臺北大學_日間學士班轉學生招生考試試題_統計學系日間學士班2、3年級 金融與合作經營學日間學士班3年級：統計學#147585

115年 - 115 國立臺北大學_碩士班一般入學考試試題_國際企業研究所：統計學#147120

115年 - 115 國立臺北大學_碩士班一般入學考試試題_統計學系：統計學#147104

115年 - 115 國立臺北大學_碩士班一般入學考試試題_自然資源與環境管理研究所：統計學#146969

115年 - 110 國立臺北大學_碩士班一般入學考試試題_企業管理學系甲組：統計學#146951

115年 - 115 國立臺北大學_碩士班一般入學考試試題_金融與合作經營學系：統計學#146920

115年 - [無官方正解]115 國立臺北大學_碩士班一般入學考試試題_經濟學系：統計學#146534

115年 - [無官方正解]115 國立嘉義大學_碩士班招生考試試題_財務金融學系：統計學#143862

115年 - 115 中央警察大學_碩士班入學考試試題：統計學#139759

114年 - 114 國立臺北大學_碩士班一般入學考試試題_統計學系：統計學#147125