. (1) Which of the following can be used to test t

13 May . (1) Which of the following can be used to test t

. (1) Which of the following can be used to test the hypothesis that two nominal variables are related?
Answer

 

a contingency table.

 

a chi-square table.

 

an ANOVA table.

 

a scatter diagram.

 

7. (2) On a very hot summer day, 5 percent of the production employees at Midland States Steel are absent from work. The production employees are randomly selected for a special in-depth study on absenteeism. What is the probability of randomly selecting 10 production employees on a hot summer day and finding that none of them are absent?
Answer

 

0.002

 

0.344

 

0.599

 

0.100

 

8. (3) A farmer who grows genetically engineered corn is experiencing trouble with corn borers. A random check of 5,000 ears revealed the following: many of the ears contained no borers. Some ears had one borer; a few had two borers; and so on. The distribution of the number of borers per ear approximated the Poisson distribution. The farmer counted 3,500 borers in the 5,000 ears. What is the probability that an ear of corn selected at random will contain no borers?
Answer

 

0.3476

 

0.4966

 

1.000

 

0.0631

 

10. (4) David’s gasoline station offers 4 cents off per gallon if the customer pays in cash and does not use a credit card. Past evidence indicates that 40% of all customers pay in cash. During a one-hour period twenty-five customers buy gasoline at this station.
What is the probability that no more than twenty pay in cash?
Answer

 

0.0

 

0.1

 

0.9

 

1.0

11. (5) A tire manufacturer advertises, “the median life of our new all-season radial tire is 50,000 miles. An immediate adjustment will be made on any tire that does not last 50,000 miles.” You purchased four of these tires. What is the probability that all four tires will wear out before traveling 50,000 miles?
Answer

 

1/10 or 0.10

 

¼ or 0.25

 

1/64 or 0.0156

 

1/16 or 0.0625

 

13. (6) If two events are independent, then their joint probability is
Answer

 

computed with the   special rule of addition

 

computed with the   special rule of multiplication

 

computed with the   general rule of multiplication

 

computed with Bayes   theorem

 

14. (7) A sample of the paramedical fees charged by clinics revealed these amounts: $55, $49, $50, $45, $52 and $55. What is the median charge?
Answer

 

$47.50

 

$51.00

 

$52.00

 

$55.00

 

15. (8) The following are the weekly amounts of welfare payments made by the federal government to a sample of six families: $139, $136, $130, $136, $147 and $136. What is the range?
Answer

 

$0

 

$14

 

$52

 

$17

 

16. (9) A disadvantage of using an arithmetic mean to summarize a set of data is
Answer

 

The arithmetic mean   sometimes has two values.

 

It can be used for   interval and ratio data.

 

It is always different   from the median.

 

It can be biased by   one or two extremely small or large values.

 

17. (10) What level of measurement is the price of an admission ticket to a movie theater?
Answer

 

Nominal

 

Ordinal

 

Interval

 

Ratio

 

18. (11) A survey includes a question regarding marital status that has the following responses: single, married, divorced, separated or widowed. What is the scale of measurement for this question?
Answer

 

Ratio

 

Interval

 

Ordinal

 

Nominal

 

20. (12) What is the variable used to predict the value of another called?
Answer

 

Independent variable

 

Dependent variable

 

Correlation variable

 

Variable of   determination

 

22. (13) Which symbol is a test statistic used to test a hypothesis about a population mean?
Answer

 

α

 

β

 

μ

 

z

 

23. (14) What is a Type II error?
Answer