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# QNT 351 Week 5, Final Exam

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Date Created: 11/09/15

1 The main purpose of descriptive statistics is to A summarize data in a useful and informative manner B make inferences about a population C determine if the data adequately represents the population D gather or collect data 2 The general process of gathering organizing summarizing analyzing and interpreting data is called A statistics B descriptive statistics C inferential statistics D levels of measurement 3 The performance of personal and business investments is measured as a percentage return on investment What type of variable is return on investment A Qualitative BConUnuous C Attribute D Discrete 4 What type of variable is the number of robberies reported in your city A Attribute BConUnuous C Discrete D Qualitative 5 What level of measurement is the number of auto accidents reported in a given month A Nominal B Ordinal C Interval D Ratio 6 The names of the positions in a corporation such as chief operating of cer or controller are examples of what level of measurement A Nominal B Ordinal C Interval D Ratio 7 Shoe sizes such as 7B 10D and 12EEE are examples of what level of measurement A Nominal B Ordinal C Interval D Ratio 8 Monthly commissions of rstyear insurance brokers are 1270 1310 1680 1380 1410 1570 1180 and 1420 These gures are referred to as A a histogram B raw data C frequency distribution D frequency polygon 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 A Histogram B Class limits C Class frequencies D Raw data 10 The sum of the deviations of each data value from this measure of central location will always be 0 AMode B Mean C Median D Standard deviation 11 For any data set which measures of central location have only one value A Mode and median B Mode and mean C Mode and standard deviation D Mean and median 12 A sample of single persons receiving social security payments revealed these monthly bene ts 826 699 1087 880 839 and 965 How many observations are below the median AO B1 C2 D3 13 A dot plot shows A the general shape of a distribution B the mean median and mode C the relationship between two variables D the interquartile range 14 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 111 B 37 C 74 D 75 15 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 A 24883 or 0027 B 539883 or 0610 C 24333 or 0072 D 182883 or 0206 16 If two events A and B are mutually exclusive what does the special rule of addition state A PA or B PA PB B PA and B PA PB C PA andor B PA PB D PA or B PA PB 17 A listing of all possible outcomes of an experiment and their corresponding probability of occurrence is called a A random variable B probability distribution C subjective probability D frequency distribution 18 The shape of any uniform probability distribution is A negatively skewed B positively skewed C rectangular D bell shaped 19 The mean of any uniform probability distribution is A b a2 B a b2 C 2 x n D nn 20 For the normal distribution the mean plus and minus 196 standard deviations will include about what percent of the observations A 50 B 997 C 95 D 68 21 For a standard normal distribution what is the probability that z is greater than 175 A 00401 B 00459 c 04599 D 09599 22 A null hypothesis makes a claim about a A Population parameter B sample statistic C sample mean D Type II error 23 What is the level of signi cance A Probability of a Type II error B Probability of a Type I error C zvalue of 196 D Beta error 24 Suppose we test the difference between two proportions at the 005 level of signi cance If the computed z is 107 what is our decision A Reject the null hypothesis B Do not reject the null hypothesis C Take a larger sample D Reserve judgment 25 Which of the following conditions must be met to conduct a test for the difference in two sample means A Data must be at least of interval scale B Populations must be normal C Variances in the two populations must be equal D Data must be at least of interval scale and populations must be normal 26 Which of the following statements about the two sample sizes is NOT true Assume the population standard deviations are equal A Sample A 11 sample B 13 B Sample A 12 sample B 14 C Sample A 13 sample B 13 D Sample A 10 sample B 16 27 What is the chart called when the paired data the dependent and independent variables are plotted A Scatter diagram B Bar chart C Pie chart D Histogram 28 What is the variable used to predict the value of another called A Independent variable B Dependent variable C Correlation variable D Variable of determination 29 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 A a one sample test of means B a two sample test of means C a paired ttest D a test of proportions 30 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 A The weight of units in process A are grouped closer than in process B B The weight of units in process B are grouped closer than in process A C Both processes are out of control D More data is needed to draw a conclusion

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