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# QNT351 FINAL EXAM ANSWERS (30-30-100%)

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Date Created: 11/14/15

QNT351 FINAL EXAM ANSWERS I got 3030 100 1 What level of measurement is the number of auto accidents reported in a given month A Interval B Ratio C Nominal D Ordinal 2 If two events A and B are mutually exclusive what does the special rule of addition state A PA or BPAPB B PA andor BPAPB C PA or BPAPB D PA and BPAPB 3 For any data set which measures of central location have only one value A Mode and standard deviation B Mode and mean C Mean and median D Mode and median 4 What is the variable used to predict the value of another called A Independent variable B Correlation variable C Variable of determination D Dependent variable 5 A null hypothesis makes a claim about a A Type 11 error B Population parameter C Sample statistic C Sample mean 6 The performance of personal and business investments is measured as a percentage return on investment What type of variable is return on investment A Continuous B Qualitative C Attribute D Discrete 7 Twenty randomly selected statistics students were given 15 multiplechoice questions and 15 openended questions all on the same material The professor was interested in determining on which type of questions the students scored higher This eXperiment is an example of Answer a paired ttest 8 A listing of all possible outcomes of an eXperiment and their corresponding probability of occurrence is called a Answer probability distribution 9 A small sample of computer operators shows monthly incomes of 1950 1775 2060 1840 1795 1890 1925 and 1810 What are these ungrouped numbers called QNT351 FINAL EXAM ANSWERS Answer Raw data 10 The mean of any uniform probability distribution is Answer a b2 11 Monthly commissions of firstyear insurance brokers are 1270 1310 1680 1380 1410 1570 1180 and 1420 These figures are referred to as A Frequency distribution B Frequency polygon C a histogram D Raw data 12 The test scores for a class of 147 students are computed What is the location of the test score associated with the third quartile A 11 1 B 75 C 37 D 74 13 The names of the positions in a corporation such as chief operating officer or controller are examples of what level of measurement A Interval B Ratio C Nominal D Ordinal 14 What is the chart called when the paired data the dependent and independent variables are plotted A Pie chart B Histogram C Scatter diagram D Bar chart 15 A sample of single persons receiving social security payments revealed these monthly benefits 826 699 1087 880 839 and 965 How many observations are below the median A 3 COW 1 2 0 16 For a hypothesis test comparing two population means the combined degrees of freedom are 24 Which of the following statements about the two sample sizes is NOT true Assume the population standard deviations are equal Answer Sample A11 sample B13 17 What type of variable is the number of robberies reported in your city A Attribute B Continuous C Discrete D Qualitative QNT351 FINAL EXAM ANSWERS 18 Which of the following conditions must be met to conduct a test for the difference in two sample means Answer Data must be at least of interval scale and populations must be normal 19 Suppose we test the difference between two proportions at the 005 level of significance If the computed z is 107 what is our decision Answer Do not reject the null hypothesis 20 The National Center for Health Statistics reported that of every 883 deaths in recent years 24 resulted from an automobile accident 182 from cancer and 333 from heart disease Using the relative frequency approach what is the probability that a particular death is due to an automobile accident Answer 24883 or 0027 21 For a standard normal distribution what is the probability that z is greater than 175 Answer 00401 22 The main purpose of descriptive statistics is to Answer Summarize data in a useful and informative manner 23 The sum of the deviations of each data value from this measure of central location will always be 0 A Standard deviation B Median C Mean D Mode 24 The shape of any uniform probability distribution is A Negatively skewed B Rectangular C Bell shaped D Positively skewed 25 What is the level of significance A Beta error B Probability of a Type I error C zvalue of 196 D Probability of a Type 11 error 26 The measurements of weight of 100 units of a product manufactured by two parallel processes have same mean but the standard of process A is 15 while that of B is 7 What can you conclude Answer The weight of units in process B are grouped closer than in process A 27 For the normal distribution the mean plus and minus 196 standard deviations will include about what percent of the observations A 68 B 95 C 50 D 997 28 A dot plot shows Answer The general shape of a distribution 29 The general process of gathering organizing summarizing analyzing and interpreting data is called QNT351 FINAL EXAM ANSWERS A inferential statistics B Levels of measurement C Statistics D Descriptive statistics 30 Shoe sizes such as 7B 10D and 12EEE are examples of what level of measurement A Ordinal B Ratio C Interval D Nominal

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