Define Statistics Statistics is the practice of gathering‚ sorting‚ and categorizing numerical information in an organized format that can be used to acquire results to specific problems. According to McClave‚ Benson‚ and Sincich (2011)‚ “Statistics is the science of data. It involves collecting‚ classifying‚ summarizing‚ organizing‚ analyzing‚ and interpreting numerical information” (p. 3). Different Types and Levels of Statistics There are two types of statistics. One is descriptive which defines
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species of tree. The sizes of the flakes were S1: 0.15 inches by 2 inches and S2: 0.25 inches by 2 inches‚ and the species of tree used were aspen‚ birch‚ and maple. For each combination of flake size and tree species‚ three samples of wood material were constructed. For each sample‚ the physical property measured was the tension modulus of elasticity in the direction perpendicular to the alignment of the flakes‚ in pounds per square inch (psi). For these data‚ a two-way ANOVA was run and the partial
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• Defining What Statistics Really Is 1.1 Nature of Statistics The term “Statistics” came from the Latin word ‘status’ which could be translated as ‘state’. The usage of this term only became popular during the 18 th century where they defined Statistics as “the science of dealing with data about the condition of a state or community”. The practice of statistics could be traced back even from the early biblical times where they gather figures related to governance of the state for they realized
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Case Problem 1: National Health Care Association(Descriptive Statistics) The National Health Care Association is concerned about the shortage of nurses the health care profession is projecting for the future. To learn the current degree of job satisfaction among nurses‚ the association has sponsored a study of hospital nurses throughout the country. As part of this study‚ a sample of 50 nurses was asked to indicate their degree of satisfaction in their work‚ their pay and their opportunities for
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Data Analysis: Analyzing Data - Inferential Statistics Inferential statistics deal with drawing conclusions and‚ in some cases‚ making predictions about the properties of a population based on information obtained from a sample. While descriptive statistics provide information about the central tendency‚ dispersion‚ skew‚ and kurtosis of data‚ inferential statistics allow making broader statements about the relationships between data. Inferential statistics are frequently used to answer cause-and-effect
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Step 1- Identify the problem Develop a problem statement- What are you going to investigate (use the 6 characteristics of a good problem statement) 1. Be interested in the problem 2. Have a manageable scope 3. Be comfortable in terms of the knowledge‚ time‚ and resources needed to investigate the problem 4. Be able to collect and analyze numerical data 5. Must be a practical or theoretical reason for you to research the problem 6. It must be ethical for you to investigate the problem
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Ch11 case Golf 1. is mean driving distances of current balls is mean driving distances of new balls is mean driving distances of sampled current balls is mean driving distances of sampled new balls Use the test statistics and normal distribution table to get p-value. If p-value is smaller than‚ then we reject H0‚ which means the mean driving distances of current balls and new balls are different. 2. From the t distribution table we find that p-value is between 0.05 and 0
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Sample No. No. of Observation 1 2 3 4 5 1 5.4 5.5 6.0 5.3 5.5 2 5.6 6.0 5.4 5.4 5.5 3 5.9 5.6 5.2 5.2 5.6 4 5.5 5.5 5.9 5.3 5.3 5 5.5 5.4 5.8 5.3 5.2 6 5.4 6.0 5.9 5.3 5.6 7 5.6 5.2 5.3 5.6 5.9 8 5.8 5.2 5.3 5.6 5.5 Construct control charts for the shaft diameter for 3-sigma limit of confidence. Find whether the process is in control or not? Test with following data and find whether it meets specifications or not. Sample No.
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Statistics is the study of the collection‚ organization‚ analysis‚ interpretation‚ and presentation of data. It deals with all aspects of this‚ including the planning of data collection in terms of the design of surveys and experiments. The word statistics‚ when referring to the scientific discipline‚ is singular‚ as in "Statistics is an art. "This should not be confused with the word statistic‚ referring to a quantity (such as mean or median) calculated from a set of data‚ whose plural is statistics ("this
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growth charts as standards rather than references. The CDC growth charts consist of a set of charts for infants birth to 36 months of age and a set of charts for children and adolescents from age 2 to 20 years. The charts for infants include sex-specific percentile curves for weight for age‚ recumbent length for age‚ head circumference for age‚ and weight for recumbent length. The CDC recommends that the WHO growth charts be used for children younger than 2 years of age‚ and the CDC charts for all
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