【正文】 ?? xnbynxby 11= ???? = 則回歸直線方程為： yc=+ （ 2）回歸系數(shù) b 的經(jīng)濟(jì)意義：當(dāng)銷(xiāo)售額每增加一萬(wàn)元，銷(xiāo)售利潤(rùn)率增加 % （ 3）計(jì)算預(yù)測(cè)值： 當(dāng) x=500 萬(wàn)元時(shí) yc=+ 500? =% 8． 某商店兩種商品的銷(xiāo)售資料如下： 商品 單位 銷(xiāo)售量 單價(jià)（元） 基期 計(jì)算期 基期 計(jì)算期 甲 乙 件 公斤 50 150 60 160 8 12 10 14 要求：（ 1）計(jì)算兩種商品銷(xiāo)售額指數(shù)及銷(xiāo)售額變動(dòng)的絕對(duì)額； （ 2）計(jì)算兩種商品銷(xiāo)售量總指數(shù)及由于銷(xiāo)售量變動(dòng)影響銷(xiāo)售額的絕對(duì)額； （ 3）計(jì)算兩種商品銷(xiāo)售價(jià)格總指數(shù)及由于價(jià)格變動(dòng)影響銷(xiāo)售額的絕對(duì)額。 (2)計(jì)算銷(xiāo)售量總指數(shù) ,計(jì)算由于銷(xiāo)售量變動(dòng)，銷(xiāo)售額的影響絕對(duì)額。 （ 2） 19841995 年該地區(qū)人口的平均增長(zhǎng)速度 . （ 1） 1995 年平均人口數(shù) ?????????? f faafaafaaa nnn 11232121 222 ? = 12 42/)184192(32/)192190(32/)190185(22/)185102( ??????????? = 萬(wàn)人 （ 2） 19841995 年該地區(qū)人口的平均增長(zhǎng)速度： % 0???? n naax 11．某地區(qū) 1995— 1999 年糧食產(chǎn)量資料如下： 年份 1995 年 1996 年 1997 年 1998 年 1999 年 糧食產(chǎn)量（萬(wàn)斤） 434 472 516 584 618 要求：（ 1）計(jì)算各年的逐期增長(zhǎng)量、累積增長(zhǎng)量、環(huán)比發(fā)展速度、定基發(fā)展速度； 15 （ 2）計(jì)算 1995 年 1999 年該地區(qū)糧食產(chǎn)量的年平均增長(zhǎng)量和糧食產(chǎn) 量 的年平均發(fā)展速度； （ 3）如果從 1999 年以后該地區(qū)的糧食產(chǎn)量按 8%的增長(zhǎng)速度發(fā)展， 2021 年該地區(qū)的糧食產(chǎn)量將達(dá)到什么水平？ 解 年 份 1995 年 1996 年 1997 年 1998 年 1999 年 糧食產(chǎn)量（萬(wàn)斤） 環(huán)比發(fā)展速度 定基發(fā)展速度 逐期增長(zhǎng)量 累積增長(zhǎng)量 434 472 108． 76 108． 76 38 38 516 109． 32 118． 89 44 82 584 113． 18 134． 56 68 150 618 105． 82 142． 40 34 184 平均增長(zhǎng)量 = 46151841 0 ?????n aa n （萬(wàn)斤） 464 34684438 ?????? 逐期增長(zhǎng)量個(gè)數(shù)逐期增長(zhǎng)量之和平均增長(zhǎng)量 （萬(wàn)斤） （ 2）平均發(fā)展速度 %61840??? n naax （ 3） 60 . ??? nn xaa =（萬(wàn)斤） 16 Basketball can make a true claim to being the only major sport that is an American invention. From high school to the professional level, basketball attracts a large following for live games as well as television coverage of events like the National Collegiate Athletic Association (NCAA) annual tournament and the National Basketball Association (NBA) and Women39。s games measures in (7576 cm) in circumference, and a women39。s bounce. Inside the covering or casing, a rubber bladder holds air. The ball must be inflated to a pressure sufficient to make it rebound to a height (measured to the top of the ball) of 4954 in ( m) when it is dropped on a solid wooden floor from a starting height of 6 ft ( m) measured from the bottom of the ball. The factory must test the balls, and the air pressure that makes the ball legal in keeping with the bounce test is stamped on the ball. During the intensity of high school and college tourneys and the professional playoffs, this inflated sphere mands considerable attention. Basketball is one of few sports with a known date of birth. On December 1, 1891, in Springfield, Massachusetts, James Naismith hung two halfbushel peach baskets at the opposite ends of a gymnasium and outlined 13 rules based on five principles to his students at the International Training School of the Young Men39。s five basic principles center on the ball, which was described as large, light, and handled with the hands. Players could not move the ball by running alone, and none of the players was restricted against handling the ball. The playing area was also open to all players, but there was to be no physical contact between players。 smaller gyms used five players on a side, and the larger gyms allowed seven to nine. The team size became generally established as five in 1895, and, in 1897, this was made formal in the rules. The YMCA lost interest in supporting the game because 1020 basketball players monopolized a gymnasium previously used by many more in a variety of activities. YMCA membership dropped, and basketball enthusiasts played in local halls. This led to the building of basketball gymnasiums at schools and colleges and also to the formation of professional leagues. Although basketball was born in the United States, five of Naismith39。 England in 1894。 and Japan in 1900. From 1891 through 1893, a soccer ball was used to play basketball. The first basketball was manufactured in 1894. It was 32 in (81 cm) in circumference, or about 4 in (10 cm) larger than a soccer ball. The dedicated basketball was made of laced leather and weighed less than 20 oz (567 g). The first molded ball that eliminated the need for laces was introduced in 1948。s basketball. Until World War II, basketball became increasingly popular in the United States especially at the high school and college levels. After World War II, its popularity grew around the world. In the 1980s, interest in the game truly exploded because of television exposure. Broadcast of the NCAA Championship Games began in 1963, and, by the 1980s, cable television was carrying regular season college games and even high school championships in some states. Players like Bill Russell, Wilt Chamberlain, and Lew Alcindor (Kareem AbdulJabbar) became nationally famous at the college level and carried their fans along in their professional basketball careers. The women39。s game. Television interest followed the women as well with broadcast of NCAA championship tourneys beginning in the early 1980s and the formation of the WNBA in 1997. Internationally, Italy has probably bee the leading basketball nation outside of the United States, with national, corporate, and 17 professional teams. The Olympics boosts basketball internationally and has also spurred the women39。s basketball league in the United States was the National Basketball League (NBL), which debuted in 1898. Players were paid on a pergame basis, and this league and others were hurt by the poor quality of games and the everchanging players on a team. After the Great Depression, a new NBL was anized in 1937, and the Basketball Association of America was anized in 1946. The two leagues came to agree that players had to be assigned to teams on a contract basis and that high standards had to govern the game。s professional leagues were attempted and failed, including the Women39。s World Basketball Association, before the WNBA debuted in 1997 with the support of th