数学検定準２級の過去問です。解き方が解らないので解説、解答お願いします！
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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... - 1](https://d1e9oo257tadp1.cloudfront.net/uploads/qa_question_image/file/1620224/thumb_l_webp_17086893672060.webp?Expires=1750522748&Signature=c8a93j1RKcJzKh6rxAg8s1jkeRv6kSg5igHBn0gHbOIV~69RrzRKTr7~koJPYcT49f4FXLRoWuwhoF49VDzvxJVIsR-7rXmvHVqRd2v5IolrlYQ5ynqj2nOxfC7ClaDpp0OfHIJv0gE4nuid9kxy-Sy-x5HLrlbOxQSllMfBe1Xd8j6-IQjSMd0d4uwyF9vRMhR7A-Lqx8ES6wpGTA~LONH8bbTD0offpuvVZ2IChK~cyzqXe225tNvMpqNRR0M-k8fHJ~hpuA6DJ~HqjU33QIXzzM2SsgeWZDitmdWnUzhyTOaqPac9uHQnYXKayolOXHLEE4pMAkxQjaq~U9qx7g__&Key-Pair-Id=K2W722D70GJS8W&Expires=1750522748&Signature=eJ-6r6H~WO2kaCl1pvrd7fOuPEJ2KDV0gDS66ikt6Xl46dJl2S761rsCFnKrCi-a18qZ6yTYg7kqHL7Mny7IZPLzUkKx5ald84a2g0vBy4Nv2QsSFYPSVyS9H4GXOxtQxrVI6XG-RPXm8tHp-Uc3AltWiqUV0yHptw2kXwuP7VXMrHeU6D8CvR9ZiozTx4pIUikPwdwfIBOUvq1k9xgoWB4liIb9ErhQtjt~XF5Pd0UIh0HYzJP8bP8j5arHKyFgi3tvKhMaaMsFxK2c7iT4kCLxtVA3wGamBAm~0pI1r1KFyvIfdwyyZ3--o6j4r-3j-uOvbCHSkWg4jBrx4cRpmw__&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... - 2](https://d1e9oo257tadp1.cloudfront.net/uploads/qa_question_image/file/1620225/thumb_l_webp_17086893673710.webp?Expires=1750522748&Signature=MjK40y4Zg9F3z0pwKN5dAFGQp5CTv-V0iXDVc6uq9MCbB5qBVDUItaG4UkxdMOtYj9bz1aP1W856EyoJxG-1~Oxxm8BiZN7nEImYhyfrrxUN1GBG1LvEba5FaDJ6oPaC9ADVbzLe7dktJ9H~8mUGPvXoa5UfZt0tTHyTKPjqRlmTrsZXQiAhmO~xzGCqfKipqRSsilBXlcFkN0NQR65KvNCAXkPiszTrbgIX92ns~wfrSG-3asyLTBsq7xZOHaSlzrjzoRys55YvEjdXGeafHEIizs4Z4b47gO-RDJi7Anh~FSEEYHZGolTzWIuddISbhUqcdyiOgwP2r6UH3R9mLg__&Key-Pair-Id=K2W722D70GJS8W&Expires=1750522748&Signature=sUwUonKuWB6pGuOoFXXBg6ZviUvsWvRWh-v3rXhoZF9GsjZTslLvTTpV0Ne-8hu8U6tONovagzUBGaNZXxBTTvmmQrmGxAgLS9IzoKKxLNkhzWii5YsEwdMhaKFIdGykvsKoS5FP2pbo0us8YWAv3w68pxd1621cnji7y0NRZJqNNhC-1jM2z16Sa2BKdLH2LqLBt4cuCloLLIjYcxf~DRw63d~pUMJQ25mGgEmJa0ltahmCMBSI9rbd92LjMVgvD5wxOweEIv5wGjW-ICFvtNQokQPDTJB-JAGID9UeoFN34LcuoNJHjM24R4rfdjuFGpDEdihXdfLneHPYzUO3Zw__&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=1750522748&Signature=b0-ZF5kcmq4Ir3OCZu7eHm7GLzTOZRWhR~h70eYFPtKoqKI4HH0Ruje3EgedZG2fwcMEEbMIsnvJSSsTY~2TiTFLZ4RPG5VrOyPjhG1JWWHMvuAOHtsARiv93B704XmliM~NSPStxErGTNicm1dp5rROwLVo2Nj-Q8Yrica~sek~~jz3KkK051DqP0yG53EGEtnRLnUkYj34cVB5Hs0kXpGZgrbBzPh~iNmq-aqEm6hWvCEMiuzjnG835ryW8y31BG2edwyzLj-3C9bL4mGHw4sn1s1xkuRY5dkJD-e0Ak75Ytn2dASHhuFq1HS8eCP36jMYyx83NTBLqN94pGyCYw__&Key-Pair-Id=K2W722D70GJS8W&Expires=1750522748&Signature=rzxKuF7SHyyf2LFVWTIV06w46-Skh-9~9Oe0LeveOoUbbp0j3A0QCKnYU3rmQWU89Dc55lYz2giF~M7C4dU~~sAQVeDSUGvmXjgFFpCkbrPpamBy3M3yMrWYyV91VRm67xXnnPtySXioWiSVEz-WR7EF74dINRsL8VCRh2c3DcgkikzXeG6O6U1xOIZsGfgmIRds8oCS~pJrsSUVBuIOTILBCjtLCzdy8yKmT1GfXEtROEo0Eu2nCl2WfPrqzpPIlPIuIunT~VLH7DKOQYISq35461EBx4G6LIZ5GPuPG4gkS9ROzZSH~RZTYqe~EelJDtGiro8iYNbfttFxYqSi-A__&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=1750522748&Signature=sDn75CgZsqKGA~vY~BWEor6RlwEAMZrTNSYppOTe2dAwTNJLRgG6zEtOJE5HbmUWfxYlzP6ZBWd19kFt57-mTr5ZrMQ9g0VnEBGJeFoQ03hV7V6u1fvg9jb3oWfppGaVwT1nPBozbXkbdxSjhdFFZZw4mFAu1I6L-XvlCvFI1egNI24Hr9EhVOechXS7KPosoA4Joxygwi8790OsOAqZHYkr203waAItDQCf4kZ17pCmqWLL4k-oXdJeiPWbzXRDLwsxeM-Q-UAcVRszyrQEzmewrCDie2DhvMv-EeTkKXnoGfRvOG3M-FJlJYYn85b1p6~~0OdFN5nN2x0o-DGl4g__&Key-Pair-Id=K2W722D70GJS8W&Expires=1750522748&Signature=daww5Plr89NXFeac5IjXzlf5CdmBfOJOqmxkrdu~4bButbJtKCv1Xv1O85kk78CAkQ2NKN0QQSURkIMietnR~qFPrJyMJbG7dVduPJ2PIwZZiqUN5r4~PFOMqdHSCflJISGhi969PzzIOXjFsez~BDjot8nyqq2jb~WTbvOr3XWNoaXg9De7b~ZebA4uvr3sFiQJ3uNwsEDYMy7FUoyYqD5n~vysAWMSPLSKgchvmfj8WXvB2h7GS1XsJ2uI6gWjJLa-L33Zff18UVf5ZYRQOxpZwnjkySUlbNXLX2uLD~-ilbEntwnUBO~LqzlTDdzKoyunMrAcSMiidoDPrcc-uw__&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=1750522748&Signature=CfxPOWpNEPNmXy0sRS8liunDDIPv-9jIzIwrXOUiXvdygzK4JD6k8o~DR60w~QggY7Defbj2r5WDY1Gwn1YgQFpzNHN55-p~akBc7xQr8iaQBJWJsrNrSAh8qA9Yj9GxxFPbi1krYNypkVdLpZQaHpGKYVNHqfyghEhqmAHXMwnHwgdciouskIi4FM~BC8e9u2moJu8eK4WbID5sQjTsKOY11VM13ifA3NG7aWuMMgYL1wHUVbi1R3ufXdMzamzy0vbDEXLuzaNGek7XSDc~vovWHMCuObE8yySD85PjlMUxlM16QSnWlfacakmD~FHvh-tT2c3W453svyY5V4qg8A__&Key-Pair-Id=K2W722D70GJS8W&Expires=1750522748&Signature=X4ed0r2yOC2GfhmmvTJYvxk9Bp3dQh55QTzKu0GMHhsqXxHmAcFggASPOGJvCxpg2CNIAK1j1KCeepVRMAhdbX1QlN7qRUpUzIdvZ32AHwMaUepN55M9J-QFb9qReqxOcgBeJSVCmWHe8uWUFYMK4xpPQ9ROYdCpVQOGwhalDNy4swGad5EZXY8ypjId9zUdRApBD-JULQASSCDgsowk2e1OvRPhDijVFbrbErCGU2Sf7xxSlG6pbaIdIlvD1nC3wrlT309QxNcuJ3sQV9kZw4udRSvw26wXic-qscZV4nqZx1MdZ2wyio4UXHFTdLfqiX6Q2nfU27v7UhZQIM9d~A__&Key-Pair-Id=K2W722D70GJS8W)
