1 1. The regression equation between years of employment (X) and discount amount % (Y) at the Happy cafeteria is given by: Y = 2*X + 5 For how many years you need to be an employee in order to get a 25% discount. 5 10 7 none of the above 1. QUESTION 2 a regression analysis on a set of data (with two variables, X and Y) outcomes a value of r-square = 78.5 What would be the interpretation of this value? QUESTION 3 1. When the level of confidence and sample standard deviation remain the same, a confidence interval for a population mean based on a sample of n = 40 will be _____ a confidence interval for a population mean based on a sample of n = 50. narrower than wider than equal to none QUESTION 4 1. A nursing home claims that their patients (n=64) will live more than 10 more years. For a test at alpha=.10 the critical z value is: __________ Acceptance range is: _______________ UESTION 5 1. A data set of size n=17 and an alpha =.01 is given. You are asked to determine its CIE. The critical value will be: 2.57 5 2.89 82 2.92 08 2.58 35 QUESTION 6 1. The null hypothesis is rejected if the p value is: >5 <5 <.0 5>5% QUESTION 7 1. If r is not significant A regression analysis should be done A regression analysis should never be done r value doesn't influence the regression significance 1. QUESTION 8 The mall has a set of data with employee age (X) and the corresponding number of annual on-the-job-accidents(Y). Analysis on the set finds that the regression equation is Y=100-3X. What is the likely number of accidents for someone aged 30? 97 100 10 none of the above 1. QUESTION 9 When the population standard deviation is unknown and the sample size is less than 30, what table value should be used in computing a confidence interval for a mean? 1t . 2 chi-square . 3z . 4 none . of the above 1. QUESTION 10 consider the following regression equation between Y and X: Y = 4.622X -100 this equation shows a positive correlation between X and Y this equation shows a negative correlation between X and Y The regression equation cannot provide information about the type of correlation that exists between the two variable. 1. 1. QUESTION 11 Mall security estimates that the average daily per-store theft is less than $100, but wants to determine the accuracy of this statistic. The company researcher takes a sample of 81 clerks and finds that mean = 103$ and s = $10. a. state the hypothesis b. give the acceptance range for H0, considering a test with alpha = .01 QUESTION 12 When you are conducting the t test, the population needs to be approximately normally distributed. True False QUESTION 13 1. A confidence interval of 90% was used to estimate the proportion of customers who buy at least two items during their shopping mall experience. A random sample of 100 customers produced a confidence interval of: 49% +/- 4%. What is the best way to explain the result? 2. Path: p Words:0 1. QUESTION 14 The range of values that the correlation coefficient can take is: -infinite to +infinite 0% to 100% -1 to +1 0 to 100 QUESTION 15 1. A coefficient of correlation equal to -.78 shows a strong correlation a weak correlation a moderate correlation r value is invalid