问题
单项选择题
某研究所测定36例结核病患者与28名健康人的脑脊液镁(mmol/L)含量，发现其样本均数分别为1.04 (mmol/L)和1.28(mmol/L)，欲进一步研究两样本均数有无差别，应选用的方法是
A．两小样本均数比较的t检验
B．两大样本均数比较的u检验
C．配对计量资料比较的t检验
D．X2 检验
E．相关分析
答案
参考答案：A
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某研究所测定36例结核病患者与28名健康人的脑脊液镁(mmol/L)含量，发现其样本均数分别为1.04 (mmol/L)和1.28(mmol/L)，欲进一步研究两样本均数有无差别，应选用的方法是
A．两小样本均数比较的t检验
B．两大样本均数比较的u检验
C．配对计量资料比较的t检验
D．X2 检验
E．相关分析
参考答案：A
The Price of a Dream I grew up poor, living with my wonderful mother. We had little money but plenty of love and attention. I was 36 and energetic. I understood that no matter how poor a person was, he could still 37 a dream. My dream was to be a sportsman. 38 I was sixteen, I had started playing baseball. I could throw a ninety-mile-per-hour fastball and hit anything that moved on the football field. I was also 39 . My high-school coach was Ollie Jarvis, who not only believed in me, but taught me 40 to believe in myself. He 41 me the difference between having a dream and realizing the dream. One particular 42 with Coach Jarvis changed my life forever. It was the summer between my junior and senior years, and a friend recommended (推荐) me for a summer job. This meant a chance for money in my pocket—money for a new bike and new clothes, and the 43 of savings for a house for my mother. Then I realized I would have to 44 summer baseball to deal with the work schedule, and that meant I would have to tell Coach Jarvis I wouldn’t be playing. When I told Coach Jarvis, he was as 45 as I expected him to be. “You have your whole life to work,” he said. “Your playing days are limited. You can’t 46 to waste them.” I stood before him with my head hanging, trying to think of the 47 that would explain 48 him why my dream of buying my mom a house and having money in my pocket was worth facing his 49 in me. “How much are you going to make at this job, son?” he asked. “Three twenty-five an hour,” I replied. “Well,” he asked, “is $3.25 an hour the 50 of a dream?” That simple question made it 51 to me the difference between 52 something right now and following a dream. I 53 myself to sports that summer, and within the year I was 54 by the Pittsburgh Pirates to play baseball, and was 55 a $20,000 contract. In 2000, I bought my mother the house of my dream!
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