第二章 Data analysis and statistical techniques：1.Sampling and forcasting 2. Summarising and analysing data2.1Sampling methods:In this chapter we will introduce different sampling methods. Including probability and non-probability sampling methods.[单选题]The correlation coefficient between A and B is 0.4 and the correlation coefficient between C and D is –0.7. Which of the following statements is correct? ( )选项:[There is a stronger relationship between A and B than between C and D.
2.2Forecasting techniques:We will be covering two principal forecasting techniques Forecasting in this chapter, regression analysis and time series analysis. Regression analysis can be applied to costs and revenues while time series analysis is generally applied to revenue.
2.3Summarising and analysing data:In Chapter 2b we saw how data can summarised and presented in tabular, chart and graphical formats. Sometimes management might need more information than that provided by diagrammatic analysis. For example, they might wish to calculate a measure of centrality (averages) and a measure of dispersion. These are the subjects of this chapter.
, The relationship between A and B and between C and D is the same.
, There is a stronger relationship between C and D than between A and B.
, There is insufficient information to determine which relationship is stronger. ]
[单选题]Which of the following statements about stratification is/are true? ( )I The sample selected will be representative of the population.II The structure of the sample will reflect that of the population if the same proportion of individuals is chosen from each stratum.III It requires prior knowledge of each item in the population.
选项:[I and III only
, I, II and III
, II and III only
, III only]
[单选题]A company which makes rechargeable batteries selects some of the batteries for examination. The procedure used chooses two random numbers, say n and m. Starting at the nth battery, every battery at an interval of m is then chosen for examination. This type of sampling is known as: ( )选项:[Multistage
, Random
, Stratified
, Systematic
]
[单选题]A company's weekly costs ($C) were plotted against production level (P) for the last 50 weeks and a regression line calculated to be C = 1,000 + 250P. Which statement about the breakdown of weekly costs is true? ( )选项:[Fixed costs are $250. Variable costs per unit are $1,000.
, Fixed costs are $1,000. Variable costs per unit are $5.
, Fixed costs are $250. Variable costs per unit are $4.
, Fixed costs are $1,000. Variable costs per unit are $250
]
[单选题]The value of the correlation coefficient between x and y is 0.9. Which of the following is correct? ( ) 选项:[There is a weak relationship between x and y.
, If the values of x and y were plotted on a graph, the line relating them would have a slope of 0.9.
, x is 90% of y.
, There is a very strong relationship between x and y.
]
[单选题]A company which makes rechargeable batteries selects some of the batteries for examination. The procedure used chooses two random numbers, say n and m. Starting at the nth battery, every battery at an interval of m is then chosen for examination. This type of sampling is known as: ( )选项:[Multistage
, Stratified
, Random
, Systematic
]
[单选题]A company's weekly costs ($C) were plotted against production level (P) for the last 50 weeks and a regression line calculated to be C = 1,000 + 250P. Which statement about the breakdown of weekly costs is true? ( )选项:[Fixed costs are $250. Variable costs per unit are $4.
, Fixed costs are $1,000. Variable costs per unit are $5.
, Fixed costs are $250. Variable costs per unit are $1,000.
, Fixed costs are $1,000. Variable costs per unit are $250
]
[单选题]The value of the correlation coefficient between x and y is 0.9. Which of the following is correct? ( ) 选项:[There is a weak relationship between x and y.
, If the values of x and y were plotted on a graph, the line relating them would have a slope of 0.9.
, There is a very strong relationship between x and y.
, x is 90% of y.
]
[单选题]The correlation coefficient between A and B is 0.4 and the correlation coefficient between C and D is –0.7. Which of the following statements is correct? ( )选项:[There is insufficient information to determine which relationship is stronger. , There is a stronger relationship between C and D than between A and B.
, The relationship between A and B and between C and D is the same.
, There is a stronger relationship between A and B than between C and D.
]
[单选题]Which of the following statements about stratification is/are true? ( )I The sample selected will be representative of the population.II The structure of the sample will reflect that of the population if the same proportion of individuals is chosen from each stratum.III It requires prior knowledge of each item in the population.
选项:[II and III only
, I and III only
, I, II and III
, III only]
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