電大生物統(tǒng)計附實(shí)驗(yàn)設(shè)計復(fù)習(xí)資料小抄(參考版)
2025-06-10 01:12本頁面
【正文】 an. Lou held a joint interview with 27 media, including China Daily, the first in a series of interview s entitled Chinese Media Along the Silk Road. The interviews w ill be in Shaanxi and Gansu provinces and the Xinjiang Uygur autonomous region, as w ell as Kazakhstan, Uzbekistan and Turkey. The media group held the first interview on Wednesday morning in Xi39。s public security bureau shows some 100 foreign visitors enjoyed the 72hour policy by the end of March, most of them from the United States, the United Kingdom and Germany. Chengdu also reported robust growth in its overall tourist industry last year. Official statistics show that it received some 150 million tourists last year, an increase of 28 percent from 2021. Around million came from abroad, an increase of 12 percent. Total revenue from tourism surpassed 133 billion yuan ($). During his visit to Kazakhstan in September, Chinese President Xi Jinping proposed that China and Central Asia join hands to build a Silk Road economic belt to boost cooperation. The idea has been w idely echoed in Central Asian countries, being an encouraging blueprint for Chinese areas along the Silk Road that has linked Asia and Europe for more than 2,000 years. In the next three weeks, China Daily reporters w ill travel through the belt in China and in Kazakhstan, Uzbekistan and Turkey. They will show the progress and expectations of the countries, businesses and peoples on the route. Shaanxi the start of the ancient Silk Road has positioned itself as the new starting point for the development of the Silk Road Economic Belt, w hich will strengthen China39。s ancient indigenous religion, while Du jiang yan is considered to be the oldest functioning watercontrol project in the world. Chengdu ranked third in tourist facilities, management and services among 60 Chinese cities in a customer satisfaction survey released last year. But, Li added that efforts are still needed to develop more tourism products, improve English services and provide accurate translation of traffic signs and scenic billboards. Zhao Yun, chairwoman of British Chamber of Commerce Southwest China, told China Daily that his colleagues found the policy very convenient. A British client once flew here and stayed for just one day to check her ordered goods, she said. Zhao was born in Shanxi province, but she has lived in Chengdu for more than 10 years. My life was like a running race moving from place to place. I also lived in Beijing and Shanghai before, she said. But Chengdu is a place that you never want to leave once settling down. It is now my second hometown, she said. If the environment is further improved, the city will attract more people to visit and live, with the 72hour visafree policy and pelling conditions in transportation, culture, climate and cuisine, he said. Foreigners also gave positive feedback on the policy. A spokesman from Dell Inc said the pany has a global hub of operation in Chengdu, so the threeday visa has an immediate and positive influence on the pany39。s level of internationalization. The policy will also bring direct economic revenue, Li said. Chengdu has many cultural legacies and is also a paradise for panda lovers with the world39。另外，還要注意，橫行、直列單位組因 素與試驗(yàn)因素間不存在交互作用，否則不能采用拉丁方設(shè)計 Visafree policy brings Chengdu biz, tourism boost. Making national headlines several times, Chengdu39。應(yīng)當(dāng)注意，在進(jìn)行拉丁方試驗(yàn)時，某些單位組因素，如奶牛的泌乳階段，試驗(yàn)因素的各處理要逐個地在不同階段實(shí)施，如果前一階段有殘效，在后一階段的試驗(yàn)中，就會產(chǎn)生系統(tǒng)誤差而影響試驗(yàn)的準(zhǔn)確性。因此，拉丁方設(shè)計一般用于 58 個處理的試驗(yàn)。 試驗(yàn)結(jié)果的分析簡便 （二）拉丁方設(shè)計的主要缺點(diǎn) 因?yàn)樵诶≡O(shè)計中，橫行單位組數(shù)、直列單位組數(shù)、試驗(yàn)處理 數(shù)與試驗(yàn)處理的重復(fù)數(shù)必須相等，所以處理數(shù)受到一定限制。 （二）隨機(jī)單位組設(shè)計的主要缺點(diǎn)當(dāng)處理數(shù)目過多時，各單位組內(nèi)的供試動物數(shù)數(shù)目也過多， 要使各單位組內(nèi)供試動物的初始條件一致將有一定難度，因而在隨機(jī)單位組設(shè)計中，處理數(shù)以不超過 20 為宜。 由于隨機(jī)單位組設(shè)計體現(xiàn)了試驗(yàn)設(shè)計三原則，在對試驗(yàn)結(jié)果進(jìn)行分析時，能將單位 組間的
試題試卷相關(guān)推薦
鄂ICP備17016276號-1