数学検定準２級の問題です。 解き方、解説お願いします！
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![統計学実践ワークブック準1級 第27章 時系列解析 問27.1[1]について教えてください... - 2](https://d1e9oo257tadp1.cloudfront.net/uploads/qa_question_image/file/1620225/thumb_l_webp_17086893673710.webp?Expires=1775067227&Signature=zH7zrjxsu24d4TnIxbNalFsbyMKtIjMojUe9uQ4VirFgmD3cbuuHr~b-R7gvU-sm75gSuvu4USiTCglgReWvDxdcoY8U6N-jLXYX2BEQttPYICizfzL4AEfT1X7elkcwTAc~u7ae3GJ8YU-NP220EcVwbciHgYF21ed7Ic7PXkMCYJGkHOoQX0iZZWqipkb41dykj4rMYhLdWOxNfMxeurMHASDCWLE-tB8x90fStK6ZLIhI0WeGFRYs3wuQTxxNdXAKJ9jh8TpmEwpAWD4gpGuNPYqUDOYR0~2go-yI36T1T~dHm3xNHqIoeSAoPNFQr~XKYMwzvs7DSEDHbJKTZQ__&Key-Pair-Id=K2W722D70GJS8W&Expires=1775067227&Signature=p61CZ-CdkfRhrTflKHJO-8gtEMnMb51JjZUFGF1E6Iu7L386az5hNmSN~wsitJCh~Vg8fUy91in2H68QT70FlzhVPJyBhTMItdBlVgzCYqiSci7vkleTbcI3mDT3AGxGVtmjXNq5-LEJT3N-JFLztb2z2E0OGN~ULZzx9O1QedDC5BdXzMP7d7~5qGvMYARBZoc1qRMFcQI6i9VQLdVW~iBGmKRQv8vK2W6VlLxF74-yfptf1yJbBdkOvWyFioICxHmjZaVI4Y5MlZnZUlswTt4bKeKVMFjkY3XZdhfgDRAWlwl-wytci2IrAjrawoKm4XsWYN-2WMP~I28SQijCRQ__&Key-Pair-Id=K2W722D70GJS8W)
![統計学実践ワークブック準1級 第27章 時系列解析 問27.1[1]について教えてください... - 3](https://d1e9oo257tadp1.cloudfront.net/uploads/qa_question_image/file/1620226/thumb_l_webp_17086893674000.webp?Expires=1775067227&Signature=ADnovqCTjme1l5WEk388aEavNpEKpduZN7LxXeE15pBhbrR6ubTsIrCY2VGmBV7SQnltbbuQk3Er~cKn4Iy6x7bfwVImCKx6cZZwDwBV8UDERYIdmOaWAn5qMxBxnDmk1Rv0~aAwpUy8-e1RUY9TTvKiU738CFoTBuQXj2Fu-SJ9StCKvEl9l~wBqLLSTm8EYXFbnsWjJgC~QyW8nUE5XBIOQP7H37HKs9DHcT9YIz9IAYG~Gx1Vw1dvEXnMIATbE0jgvG5pAztyUGeSAPaQHozlQFg5IjUH8wREDMSsF9lxXjHs6IzJPHCUel0pfcrlvqq36VLPK6ApTviKp1CQGg__&Key-Pair-Id=K2W722D70GJS8W&Expires=1775067227&Signature=UFxGVTSY0btglAqabGrZeTrY5pO-qWFB00neSl6mdiPGVR9Av~-0MI4Nsb9iwLOIsHpbYBZA2BBeK8AID5s-NNsXKU1tjeIEfCbh4wTmFBRyhadmsX9nD6Gg4Lq5tf4jeBIPqMYKwoJS29iGa9IMYuQzQfj2NP-x9HaXV5mnocLwerogevJ~Y2rlrt-rpyRIIn-b2sCpnhqkyZqxTsMqdl5dj48ethWyZTTvl5aaU4PqbqwpjKAg7ORqFY~ULiA5vzV9CXKHOJ2A-c8r0mkS5ab9h-W-AFR~nMEI5qLxjJeOAeDrA~CE~to-J-mnD722iVEsYdGfPkucmnMEY3H8xA__&Key-Pair-Id=K2W722D70GJS8W)
![統計検定準1級2021年6月の問6です。
[1]の解説で、1行目から2行目に変形できるのは... - 1](https://d1e9oo257tadp1.cloudfront.net/uploads/qa_question_image/file/1618287/thumb_l_webp_17082553992390.webp?Expires=1775067227&Signature=ggRCGulH~qxckdjd4UO3mpLDm-Du2Ve4ntIrPYhkd2ultpcDrBzw43KbQCns4YDQ3OrSjl6PH8b3f2ACenShcjkIptBXQ8uCBw~9eYfrvBkHc7D1UicOXQd8cDkRAAz3cpLgEdc~8OhVb9jAVpRsPLRH~bB-ES3pgQPrXVQvPqNA7Zd0B8dgobI497NB-LOzTaazgHBFk~tOosEiNyYNCVpd-H83BQJKT0wZxXTh5wP4GzeHOjzZpS8ExBnzULcaLSApE2xqr57d4V2M8H5xOlsHxC55~Fq3bJWDO1Y0aT4EkYPr0SiBvtY56ch81yW46BYRA2woEe1ZU6SHWcNYmg__&Key-Pair-Id=K2W722D70GJS8W&Expires=1775067227&Signature=yBmd8TrwpqAcn8CC--ghWzO7tyhfWtF5Q4burlHLfYyG-DUWjbSm2H3~pSwNTgQZwnDB5wPSKabefeHKzqHeOetgHm0LroLRDX4VZ~SV-dWIE-iaA-zJf0vRMO5WDRL~639uR6S5CGRcyEXPhwbZpoDt2D5bgD8SkQMuNhvIfskZUGtPtLtr3I~kOAKRoVAWJfbfLPojjPF1w~70GZQ5a~z26NylNL6RW3YRrFxyHxqMc3amvnQ62-YBtf9dFtNxEWArifToezNH2DGRehQwnj8ymG0HTO37D2kyGPOJw6IJnv37uwAgX8sPCvi7Fnned4aP5r6Y08TAgizkup8ieA__&Key-Pair-Id=K2W722D70GJS8W)
![統計検定準1級2021年6月の問6です。
[1]の解説で、1行目から2行目に変形できるのは... - 2](https://d1e9oo257tadp1.cloudfront.net/uploads/qa_question_image/file/1618288/thumb_l_webp_17082553993910.webp?Expires=1775067227&Signature=czqY5OQe-on4x9viQFASrJG5FQkIKSRl2V~spkr-JDMAznkqa7BJGX7QcT75G5AXIwgMueIWdG1qIQD5wr~cUcNgxmSL-7-t46D7Vy1rv40gTLSTy~dPkIPgqOTjR5~qes4MpNqgtIR2gqN63jKgK9dg5TXcx6gXTn3vVXT3gw3TgTbq9fQ6euCC9R4SBPlcZ~c14SCHiZ2JSmmLp2ihq68xPwBNvaI9MUC8ke3VqqbgYzh~ROfdGZ2Q2oIwVIM1OyIz4V9zpsz4QNbGjNXaGwCIS4Kbsz5E1ViIOJzFoBXCh2P~iLcbOm644f1rWYPFytxIRvhzNG~xaRRnbi~zJg__&Key-Pair-Id=K2W722D70GJS8W&Expires=1775067227&Signature=GYj-6S-2i5AxnaGTwVuzb1PEqK6w7oued1ce-pbBG0fgyA1tfKCI3uKn8maR6ZjRX7jFCwMJaqLd4l0D7Hn2B-IXFrFqQBusW~smowluHf2UXAg90cYHy1AnC4HE3vorbWHjjOL-prfW7FtMVV8r~vDE8PyzTrg23bbzxrkQxSqAhVDKshBXDZe1PtOZ1V4Bb3V6~V72DrOgvo6ji~~8iAr5WeDsmNmsQtCcWFVcAZ3vgbxHHCcCnk4XGaiiK7q-ce2UNX92jbI6G~ET02L7ZjV4DzlHVvH0BA60pxvR6TQokpQq-6gUAduaNaG25rPXDagEeSSNAV-EYMDDzZ6hDw__&Key-Pair-Id=K2W722D70GJS8W)
