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

3)  The  performance  of  personal  and  business  investments  is  measured as a percentage, return on investment. What type of variable is return on investment?

4)  What  type  of  variable  is  the  number  of  robberies  reported  in  your city?

5) What level of measurement is the number of auto accidents reported

in a given month?

6)  The  names  of  the  positions  in  a  corporation,  such  as  chief  operating officer or controller, are examples of what level of measurement?

7) Shoe sizes, such as 7B, 10D, and 12EEE, are examples of what level of measurement?

8)  Monthly  commissions  of  first-year  insurance  brokers  are  $1,270,

$1,310, $1,680, $1,380, $1,410, $1,570, $1,180, and $1,420. These figures are referred to as

9)  A  small  sample  of  computer  operators  shows  monthly  incomes  of $1,950, $1,775, $2,060, $1,840, $1,795, $1,890, $1,925, and $1,810. What are these ungrouped numbers called?

10)  The  sum  of  the  deviations  of  each  data  value  from  this  measure  of central location will always be 0

11)  For  any  data  set,  which  measures  of  central  location  have  only  one value?

12)  A  sample  of  single  persons  receiving  social  security  payments

revealed  these  monthly  benefits:  $826,  $699,  $1,087,  $880,  $839,  and $965. How many observations are below the median?

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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?

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?

16)  If  two  events  A  and  B  are  mutually  exclusive,  what  does  the  special rule of addition state?

17)  A  listing  of  all  possible  outcomes  of  an  experiment  and  their

corresponding probability of occurrence is called a

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

20) For the normal distribution, the mean plus and minus 1.96 standard

deviations will include about what percent of the observations?

21)  For a standard  normal  distribution,  what  is the  probability  that  z is greater than 1.75?

22) A null hypothesis makes a claim about a

A. A null hypothesis makes a claim about a

B. sample statistic

C. sample mean

D. Type II error

23) What is the level of significance?

A. Probability of a Type II error

B. Probability of a Type I error

C. z-value of 1.96

D. Beta error

24) Suppose we test the difference between two proportions at the 0.05

level of significance. If the computed z is -1.07, what is our decision?

25)  Which  of the  following conditions  must  be  met  to  conduct  a test  for the difference in two sample means?

26) Which of the following statements about the two sample sizes is NOT true? Assume the population standard deviations are equal.

27)  What  is  the  chart  called  when  the  paired  data  (the  dependent  and independent variables) are plotted?

28) What is the variable used to predict the value of another called?

29)  Twenty  randomly  selected  statistics  students  were  given  15

multiple-choice questions and 15 open-ended 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

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?