吸收
发表于 2025-3-21 19:01:06
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crescendo
发表于 2025-3-21 23:51:02
Some statistical notation,tion will be made in later chapters within the context of particular statistical methods. Worksheet 2 which follows this chapter is intended to help you to use your calculator and become familiar with the notation.
pessimism
发表于 2025-3-22 01:37:31
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后天习得
发表于 2025-3-22 06:12:54
Probability,having been drawn from a larger ‘parent’ population. Conclusions from sample data about the populations (which is a branch of statistics called’ statistical inference’ see Chapter 8 onwards) must necessarily be made with some uncertainty since the sample cannot contain all the information in the pop
暂时休息
发表于 2025-3-22 11:28:02
Hypothesis testing, previous chapter we discussed one branch of inference, namely estimation, particularly confidence interval estimation. Another important branch of inference is hypothesis testing which is the subject of much of the remainder of this book. See Fig. 10.1.
淘气
发表于 2025-3-22 15:30:03
Non-parametric hypothesis tests,re less powerful than the corresponding ‘parametric’ tests, that is we are less likely to reject the null hypothesis and hence accept the alternative hypothesis, when the alternative hypothesis is correct. We can therefore conclude that parametric tests are generally preferred if their assumptions a
淘气
发表于 2025-3-22 19:40:11
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VAN
发表于 2025-3-23 01:03:01
Regression analysis,ables (provided by a correlation coefficient) as in predicting the value of one variable from the value of the other variable. For example, if trainee salesmen take a test at the end of their training period, can the test score be used to predict the first-year sales, and how accurate is the predict
Flinch
发表于 2025-3-23 02:39:10
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都相信我的话
发表于 2025-3-23 06:21:53
What is statistics?,th. However, in the title of this chapter the singular noun’ statistics’ is used to mean the science of collecting and analysing data where the plural noun ‘data’ means numerical or non-numerical facts or information.