Có 20+ tài liệu thuộc chủ đề "nghiên cứu định lượng"
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CHÍNH XÁC HÓA MỘT KHÁI NIỆM TRONG NGHIÊN CỨU ĐỊNH LƯỢNG. Trong nghiên cứu định lượng, chỉ tiêu trung bình (mean) được dùng để mô tả ý kiến chung. Hiện nay có ba cách phân tổ để xếp loại giá trị mean nhằm đánh giá đối tượng nghiên cứu. Vì ba cách có sự khác nhau nên cùng một nguồn...
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In doing this we are following in the footsteps of the ‘father of algebra’, Mohammed ibn-Musa al-Khwarizmi. The first part of the Arabic title gives us the word algebra. These types of expression are called equations because of the equals sign. of the other unknown along the other axis. To ensure that your line is accurate it is important to...
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If an equation is not linear the size of the change in y that comes about when x changes does depend on how big x is. The inventor of the new Slugar household labour-saving gadget prepares a business plan to attract investors for the venture. She anticipates that over time sales of the prod- uct will grow according to the...
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Before you can use probability to reflect the chance variation in busi- ness situations you need to know how to get some idea of the variation.. In order to do this in appropriate ways it is important that you are aware of the different types of data that you may meet.. For example the number of telephone calls made to...
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The techniques we use depend on the type of data we want to present, in the same way as the suitability of the methods of arranging data featured in the last chapter depended on the type of data. Displaying qualitative data is fairly simple if there are few categories of the attribute or characteristic being investigated. the number in each...
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Find the median of the data in Example 6.1.. Find the median of the data in Example 6.2.. The position of the median is 9.5th so the median is located half way. To get the arithmetic mean you first get the sum of the observations and then divide by n, the number of observations in the set of data.. The...
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The establishment of the relationship between smoking and health problems transformed the tobacco industry. The chapter will introduce you to some of the techniques that com- panies and other organizations use to analyse bivariate data. If correlation analysis tells us there is a connection we can use regres- sion analysis to identify the exact form of the relationship. The Y...
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However, often the most important aspect of time-based data is the time factor and the tech- niques in the previous two chapters would not allow us to bring that out of the data.. At this point you may find it useful to try Review Question 8.1 at the end of the chapter.. We can calculate a simple aggregate price index...
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Long distance – analysing time series data. identify the components of time series. employ classical decomposition to analyse time series data. produce forecasts of future values of time series variables. apply exponential smoothing to analyse time series data. use the technology: time series analysis in MINITAB and SPSS. This sort of record can help managers review the company performance over...
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The source of the opinion on which the probability is based is usually an expert.. This is the relative frequency of wins and can be used to esti- mate the probability that the horse wins its next race.. What is the probability that it will win its next race?. What is the probability that you win a cash prize if...
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11.1 Expectation. Expectation is using a probability to produce a predicted or expected value of the outcome.. In these cases the probabilities can be applied to the monetary consequences of the outcomes to produce a prediction of the average amount of money income or expenditure. If the train is more than two hours late the com- pany refunds the cost...
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12.1 Simple probability distributions. The probability that a condom is defective (D) is 0.1 and the probability it is good (G) is 0.9.. The probability that a packet of three contains no defectives is the probability that a sequence of three good condoms were put in the packet.. P(1 Defective) P(DGG) P(GDG) P(GGD) The probability that the first of these...
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make use of the normal distribution and appreciate its import- ance. become acquainted with business uses of the normal distribution. 13.1 The normal distribution. It is symmetrical, one side is the mirror image of the other.. Figure 13.1 illustrates the shape of the normal distribution. Figure 13.1 The normal distribution. For convenience the equal- ities are left out of the...
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critical path analysis (CPA) to establish the minimum duration of the project by identifying those tasks whose completion on time is essential, the critical activities. Beyond this they can bring into consideration the probability distributions that reflect the chances of the activities being completed by specific times using the program evaluation and review technique (PERT). 14.1 Network analysis. This is...
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Inevitably a number of those customers will have died in the period since buying their car and thus cannot be included in the survey.. Although not as accurate as the results of a population survey, sample results can be precise enough to serve the purposes of the investigation.. Each of the samples you could select from a population inevitably excludes...
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make use of the t distribution and appreciate its importance. become acquainted with the business origins of the t distribution. So if we want to use, say, a sample mean to predict the value of the population mean we will be using something that varies from sample to sample, the sample mean (x. You would find that the mean of...
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The choice of independent or dependent samples depends on the context of the test. The null hypothesis we use in comparing population means is based on the difference between the means of the two populations. The hypotheses listed in Table 17.1 all assume that the focus of the test is that there is no difference between the population means. Test...