快速查题-ACCA英国注册会计师试题

A customer returns a faulty product to a firm for repair under a warranty scheme. The firm operates a total quality management system.Which of the following best describes the cost of the repair?

The following four data pairs have been obtained： (1, 5), (2, 6), (4, 9), (5, 11). Without carrying out any calculations, which of the following correlation coefficients best describes the relationship between x and y?

A company's management accountant is analysing the reject rates achieved by 100 factory operatives working in identical conditions. Reject rates, Y%, are found to be related to months of experience, X, by this regression equation： Y = 20 - 0.25X. (The correlation coefficient was r = -0.9.) Using the equation, what is the predicted reject rate for an operative with 12 months' experience?

A regression equation Y = a + bX is used to forecast the value of Y for a given value of X. Which of the following increase the reliability of the forecast? (i) A correlation coefficient numerically close to 1 (ii) Working to a higher number of decimal places of accuracy (iii) Forecasting for values of X outside the range of those used in the sample (iv) A large sample is used to calculate the regression equation

Using data from twelve European countries, it has been calculated that the correlation between the level of car ownership and the number of road deaths is 0.73. Which of the statements shown follow from this?(i) High levels of car ownership cause high levels of road deaths(ii) There is a strong relationship between the level of car ownership and the number of road deaths(iii) 53% of the variation in the level of road deaths from one country to the next can be explained by the corresponding variation in the level of car ownership(iv) 73% of the variation in the level of road deaths from one country to the next can be explained by the corresponding variation in the level of car ownership