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Question;126. If X and Y have a large;positive covariance and a coefficient of correlation near 1 then we can say;that;a. X and Y have a strong positive non-linear relationship;b. X and Y have a strong negative linear relationship;c. X and Y have a weak positive linear relationship;d. X and Y have a strong positive linear relationship;e. None of the above;127. The;correlation coefficient is used to determine;a. The strength of the linear relationship between x and y;b. The least squares estimates of the regression parameters;c. The predicted value of y;for a given value of x;d.;The coefficient of variation;e. None of the above;128. In regression analysis, the;residuals represent the;a.;Difference between the actual y values;and their predicted values;b.;Difference between the actual x;values and their predicted values;c. Square;root of the coefficient of correlation;d. Change;in y per unit change in x;e. None of the above;129. In;simple linear regression, which of the following statements indicate no linear;relationship between the variables x;and y?;a.;Coefficient of correlation is 1;b The;correlation coefficient is 0;c. Sum of;squares for error is 0;d.;Covariance is relatively large;e. None of the above;130.;Which of the following statements about the correlation coefficient is correct?;a.;it is a number that indicates the direction of the relationship between the;dependent variable y and the independent variable x;b.;it is a number that indicates the strength of the relationship between the;dependent variable y and the independent variable x;c.;both a and b are correct;d.;neither a nor b is correct;e. None of the above are correct;131.;If the correlation coefficient, r, is equal to 0, then;a.;the slope of the least squares regression line is zero;b.;there is no linear relationship between the dependent variable y and the;independent variable x;c.;the covariance will also be 0 or close to 0;d.;all of the above are correct;e. None of the above are correct;132.;If all data points (pairs of x and y observations) lie on a perfectly straight;line sloping upwards, the correlation coefficient is equal to;a.;+1;b.;-1;c.;0;d.;+2;e. None of the above;133.;If all data points (pairs of x and y observations) lie on a perfectly straight;line sloping downwards, the correlation coefficient is equal to;a.;+1;b.;-1;c.;0;d.;+2;e. None of the above;134. Which of the following errors;can be reduced by good randomization techniques and increasing the sample size?;a. Data acquisition error;b. Sampling error;c. Non-response error;d. Selection bias;e. None of the above;135. During a particular sampling process;great care was taken to eliminate all non-sampling error. However, there will;still be a difference between the population mean and the sample mean. This;difference is due to;a. non-response error;b. selection bias;c. data acquisition error;d. sampling error;e. None of the above;136. Rob, a data-capturer with STATS SA;incorrectly records an age of 52 as 25.;Which kind of error is this an example of?;a. sampling error;b. selection bias;c. data acquisition error;d. non-response error;e. None of the above;137. When the respondents to a;questionnaire have different characteristics from those who did not choose to;participate in the survey, the survey will likely suffer from which kind of;error?;a. sampling error;b. selection bias;c. data acquisition error;d. non-response error;e. None of the above;138. Which of the following statements;is/are correct?;a. a non-sampling error may be caused by;the wording of a questionnaire;b. selection bias occurs when some;respondents choose not to answer a questionnaire;c. data acquisition error occurs when a;sample is not representative of the population being studied;d. all of the above statements are correct;e. None of the above;139. Which of the following errors is made;when data collected in a survey is entered incorrectly by the data capturer?;a. sampling error;b. selection bias;c. data acquisition error;d. non-response error;e. None of the above;140. Which of the following;exhibits the characteristics of sampling error?;a. an estimate of the;average wages of 10,000 employees using a sample of 400 employees;b. answers to the question;?Do you abuse your children??;c. a person receives a;questionnaire via email and deletes it without replying;d. a data capturer enters;the response to a certain question incorrectly;e. None of the above;141. Which of the following;exhibits the characteristics of non-response error?;a. an estimate of the;average wages of 10,000 employees using a sample of 400 employees;b. answers to the question;?Do you think the government is doing a good job on health care provision??;c. a person receives a;questionnaire via email and deletes it without replying;d. a data capturer enters;the response to a certain question incorrectly;e. None of the above;142. Which of the following is/are examples;of non-sampling errors?;a. errors that arise from the incorrect;recording of responses;b. errors that arise when responses are not;obtained from some members of the sample;c. errors that arise when some members of;the target population cannot possibly be selected in the sample;d. all of the above are examples of;non-sampling errors;e. None of the above;143. Which of the following errors occurs;when some members of the target population cannot possibly be selected in the;sample?;a. sampling error;b. selection bias;c. data acquisition error;d. non-response error;e. None of the above;144. A sample of 20 observations has a standard;deviation of 3. The sum of the squared deviations of observations from the;sample mean is;a. 20;b. 23;c. 29;d. 60;e. 171;145. Which measure of central location is;meaningful when the data are nominal?;a. the arithmetic mean;b. the geometric mean;c. the median;d. the mode;e. both a and b;146. Which of the following are measures of;the linear relationship between two variables?;a. the covariance;b. the correlation coefficient;c. the variance;d. the standard deviation;e. both a and b;147. Which of the following summary;measures is most affected by outliers?;a. the median;b. the geometric mean;c. the range;d. the interquartile range;e. all the above are equally affected;148. Which of the following cannot be;easily approximated from a box-and-whisker plot?;a. the range;b. the interquartile range;c. the second quartile;d. the standard deviation;e. all of

 

Paper#62452 | Written in 18-Jul-2015

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