Question You conduct a hypothesis test and you observe values for the sample mean and sample standard deviation when n = 25 that do not lead to the rejection of . You calculate a p-value of 0.0667. What will happen to the p-value if you observe the same sample mean and standard deviation for a sample > 25? Answer decrease Question For the chi-square test to be effective, the expected value for each cell in the contingency table has to be at least Answer 5 Question For t distribution, increasing the sample size, the affect will be on Answer All the options Question If we reject the null hypothesis, we might be making Answer TypeI Error Question In a regression, that the standard error of the regression is, the greater the accuracy of the prediction will be Answer Smaller Question A residual is defined as Answer \(Y-\widehat{Y}\) Question In regression analysis, the variable that is used to explain the change in the outcome of an experiment, or some natural process, is called Answer all of the above (a-c) are correct Question The regression line is drawn so that: Answer The sum of the squared errors is as small as possible Question The percent of total variation of the dependent variable Y explained by the set of independent variables X is measured by Answer Coefficient of Determination Question If the coefficient of determination is 0.81, the correlation coefficient Answer could be either \(+ 0.9 or - 0.9\) Question Suppose men always married women who were 10 percent shorter than they were. The correlation coefficient of the heights of married couples would be Answer 1.0 since the height of the man is always predictable from the height of the woman Question We measure heights and weights of 100 twenty-year old male college students. Which will have the higher correlation Answer Both will have the same correlation Question Suppose the correlation coefficient between heights (as measured in feet) versus weight (as measured in pounds) is 0.40. What is the correlation coefficient of height measured in inches versus weight measured in ounces? [12 inches = one foot; 16 ounces = one pound] Answer 0.4 Question An investigator is studying the relation between the physical and intellectual growth of primary school children (grades 1-6). At each grade level, she notes that the correlation between the height of children and the size of their vocabulary is zero. For all students in the school, the correlation is likely to be Answer Positive Question A summary measure that describes any given characteristic of the population is known as a ___________ Answer Parameter Question A _________ sample is formed by selecting one unit at random and then selecting additional units at evenly spaced intervals until the sample has been formed Answer Systematic Question Laspeyre’s index numbers possess ___________ Answer Upward bias Question Most commonly used index number is____________ Answer None Question Investor wishing to invest N100,000 in one of three possible investment alternatives, A, B, and C is an example of Answer Decision making under uncertainty Question The mean of a distribution is 23, the median is 24, and the mode is 25.5. It is most likely that this distribution is: Answer Negatively Skewed Question The mean of a distribution is 14 and the standard deviation is 5. What is the value of the coefficient of variation? Answer 0.357 Question The mean deviation of the series \(a, a + d, a +2d \cdots + 2n\) from its mean is Answer n (n +1) d /2n +1 Question A student obtained the mean and the standard deviation of 100 observations as 40 and 5.1. It was later found that one observation was wrongly copied as 50, the correct figure being 40. Find the correct mean and the S.D Answer Mean = 39.9, S.D =5 Question For a negatively skewed distribution, the correct inequality is____________ Answer Mean Question What percentage of values is greater the 3rd quartile? Answer 0.25 Question Which of the following is a unit less measure of dispersion? Answer Coefficient of variation Question Individual data is another wise called as ___________ Answer raw data Question The data given as 5, 7, 12, 17, 79, 84, and 91 will be called as____________ Answer An individual series Question Which of the following example does not constitute an infinite population? Answer Population of heights of 15 year old children. Question In a web-based survey, customers are asked to rate your company’s product on the following scale: Excellent, good, average, poor. The above scale is _____________________ Answer ordinal Question You conduct a hypothesis test and you observe values for the sample mean and sample standard deviation when n = 25 that do not lead to the rejection of . You calculate a p-value of 0.0667. What will happen to the p-value if you observe the same sample mean and standard deviation for a sample > 25? Answer decrease Question For the chi-square test to be effective, the expected value for each cell in the contingency table has to be at least Answer 5 Question For t distribution, increasing the sample size, the affect will be on Answer All the options Question If we reject the null hypothesis, we might be making Answer TypeI Error Question In a regression, that the standard error of the regression is, the greater the accuracy of the prediction will be Answer Smaller Question A residual is defined as Answer \(Y-\widehat{Y}\) Question In regression analysis, the variable that is used to explain the change in the outcome of an experiment, or some natural process, is called Answer all of the above (a-c) are correct Question The regression line is drawn so that: Answer The sum of the squared errors is as small as possible Question The percent of total variation of the dependent variable Y explained by the set of independent variables X is measured by Answer Coefficient of Determination Question If the coefficient of determination is 0.81, the correlation coefficient Answer could be either \(+ 0.9 or - 0.9\) Question Suppose men always married women who were 10 percent shorter than they were. The correlation coefficient of the heights of married couples would be Answer 1.0 since the height of the man is always predictable from the height of the woman Question We measure heights and weights of 100 twenty-year old male college students. Which will have the higher correlation Answer Both will have the same correlation Question Suppose the correlation coefficient between heights (as measured in feet) versus weight (as measured in pounds) is 0.40. What is the correlation coefficient of height measured in inches versus weight measured in ounces? [12 inches = one foot; 16 ounces = one pound] Answer 0.4 Question An investigator is studying the relation between the physical and intellectual growth of primary school children (grades 1-6). At each grade level, she notes that the correlation between the height of children and the size of their vocabulary is zero. For all students in the school, the correlation is likely to be Answer Positive Question A summary measure that describes any given characteristic of the population is known as a ___________ Answer Parameter Question A _________ sample is formed by selecting one unit at random and then selecting additional units at evenly spaced intervals until the sample has been formed Answer Systematic Question Laspeyre’s index numbers possess ___________ Answer Upward bias Question Most commonly used index number is____________ Answer None Question Investor wishing to invest N100,000 in one of three possible investment alternatives, A, B, and C is an example of Answer Decision making under uncertainty Question The mean of a distribution is 23, the median is 24, and the mode is 25.5. It is most likely that this distribution is: Answer Negatively Skewed Question The mean of a distribution is 14 and the standard deviation is 5. What is the value of the coefficient of variation? Answer 0.357 Question The mean deviation of the series \(a, a + d, a +2d \cdots + 2n\) from its mean is Answer n (n +1) d /2n +1 Question A student obtained the mean and the standard deviation of 100 observations as 40 and 5.1. It was later found that one observation was wrongly copied as 50, the correct figure being 40. Find the correct mean and the S.D Answer Mean = 39.9, S.D =5 Question For a negatively skewed distribution, the correct inequality is____________ Answer Mean Question What percentage of values is greater the 3rd quartile? Answer 0.25 Question Which of the following is a unit less measure of dispersion? Answer Coefficient of variation Question Individual data is another wise called as ___________ Answer raw data Question The data given as 5, 7, 12, 17, 79, 84, and 91 will be called as____________ Answer An individual series Question Which of the following example does not constitute an infinite population? Answer Population of heights of 15 year old children. Question In a web-based survey, customers are asked to rate your company’s product on the following scale: Excellent, good, average, poor. The above scale is _____________________ Answer ordinal