BNAL 306 - ODU - TEST#2 QUESTIONS AND VERIFIED
ANSWERS
One of the measures of the effectiveness of a stimulus is how much the viewers pulse
rate increases on exposure to it. In testing a lively music theme for its television
commercials, an advertising agency shows ads with the new music to 25 viewers and
their mean pulse rate is 20.5 beats per minute while the mean pulse rate per minute for
a comparable sample of 25 viewers seeing the same ads with the old music was 16.9
beats per minute. Is the new music theme better? - Answers - [Pool-Variance t Test for
the Difference Between Two Means] comparing two independent means
The marketing manager of a tourist company wants to be able to predict the number of
calls to a toll free number asking for pamphlets, maps and other tourist related
information based upon the number of advertisements placed the previous week, the
number of calls received the previous week, and the number of airline tour bookings for
the current week. - Answers - [Multiple Regression] make a prediction based on more
than one independent variable
A study has been carried out to determine if there is a difference in the average dollar
contributions made by clerical workers at three different firms. - Answers - [One -Way
ANOVA F test for the Differences Among More Than Two Means] comparing 3 means
A trucking firm is considering the installation of a new, low restriction engine air filter for
its long-haul trucks, but doesn't want to make the switch unless the new filter can be
shown to improve the fuel economy (miles per gallon) of these vehicles. A test is set up
so that each of 10 trucks makes the same run twice- once with the old filtration system
and once with the new version. - Answers - [Paired t Test] using the same 10 trucks so
the two means are dependent
A personnel director wants to determine if there is a relationship between the number of
years an employee has worked and the number of shares of company stock that they
own. - Answers - [Correlation Analysis] relationship between two quantitative variables
According to the ICR Research Group, 63% of Americans in the 18-34 age group say
they are comfortable filing income tax returns electronically, compared to just 49% of
those 55-64. They sampled 200 people from each age group to determine if the
younger set were more comfortable with electronic filing than those in the older group. -
Answers - [Z test for the Differences Between Two Proportions] comparing two
proportions
Researchers want to determine if there is a relationship between educational level and
whether a customer chooses a paper or plastic bag or says no preference at a grocery
, store checkout. - Answers - [Chi-Square Test for Independence] relationship between
two categorical variables
It has been reported that the average visitor from Japan spent $1953 during a trip to the
United States, while the average for a visitor from the United Kingdom was $1738. Does
the visitor from the United Kingdom spend significantly higher than a visitor from Japan?
- Answers - [Pool-Variance t Test for the Difference Between Two Means] comparing
two indepedent means
A movie complex has a sellout for three movies rated G, PG, and R that they show
simultaneously on a Friday evening. A sample of patrons from each movie is observed
to determine if they purchase snacks or do not. Could the percentage buying snacks be
the same for each movie? - Answers - [Chi-Square Test for Differences Among More
Than Two Proportions] comparing three proportions
For the top 20 top grossing US films made during the 1990's, we want to determine the
relationship between the domestic gross ticket sales and the foreign grass ticket sales
(both in millions of US dollars). - Answers - [Correlation Analysis] relationship between
two quantitative variables
We want to predict fuel consumption in billions of gallons based upon the flying hours of
turboprop general aviation aircraft. - Answers - [Simple Linear Regression] predict
dependenet variable based on one independent variable
A company uses a great deal of water in the process of making industrial milling
equipment. They want to comply with federal standards which require the average ph
level to not exceed 7.4 so they take 95 samples of water from after it goes through their
water purification system and before it reaches the settling pond and they measure the
ph level. - Answers - [t Test of Hypothesis for the Mean] one sample mean
Is there a difference in the percent of college and university professors who use
computers on the job as compared to teachers at the high school level and below? -
Answers - [Z test for the Differences Between Two Proportions] two proportions
A major brokerage firm company has an office in Miami. The manager is evaluated
based upon the number of new clients generated each quarter. Data on number of new
clients is available from 1st quarter of 1998 through the fourth quarter of 2004. We want
to predict the number of new clients in the third quarter of 2006. - Answers - [Time
Series Forecasting] independent variable is time
AAA wants to determine EPA mileage ratings of new cars based upon their weight and
whether they are standard or automatic transmission. - Answers - [Multiple Regression]
predict dependenet variable based on two independent variables
A random sample of 1000 heads of household were asked about their borrowing habits
(only for real estate and car, borrow for short term purchases such as appliances and
ANSWERS
One of the measures of the effectiveness of a stimulus is how much the viewers pulse
rate increases on exposure to it. In testing a lively music theme for its television
commercials, an advertising agency shows ads with the new music to 25 viewers and
their mean pulse rate is 20.5 beats per minute while the mean pulse rate per minute for
a comparable sample of 25 viewers seeing the same ads with the old music was 16.9
beats per minute. Is the new music theme better? - Answers - [Pool-Variance t Test for
the Difference Between Two Means] comparing two independent means
The marketing manager of a tourist company wants to be able to predict the number of
calls to a toll free number asking for pamphlets, maps and other tourist related
information based upon the number of advertisements placed the previous week, the
number of calls received the previous week, and the number of airline tour bookings for
the current week. - Answers - [Multiple Regression] make a prediction based on more
than one independent variable
A study has been carried out to determine if there is a difference in the average dollar
contributions made by clerical workers at three different firms. - Answers - [One -Way
ANOVA F test for the Differences Among More Than Two Means] comparing 3 means
A trucking firm is considering the installation of a new, low restriction engine air filter for
its long-haul trucks, but doesn't want to make the switch unless the new filter can be
shown to improve the fuel economy (miles per gallon) of these vehicles. A test is set up
so that each of 10 trucks makes the same run twice- once with the old filtration system
and once with the new version. - Answers - [Paired t Test] using the same 10 trucks so
the two means are dependent
A personnel director wants to determine if there is a relationship between the number of
years an employee has worked and the number of shares of company stock that they
own. - Answers - [Correlation Analysis] relationship between two quantitative variables
According to the ICR Research Group, 63% of Americans in the 18-34 age group say
they are comfortable filing income tax returns electronically, compared to just 49% of
those 55-64. They sampled 200 people from each age group to determine if the
younger set were more comfortable with electronic filing than those in the older group. -
Answers - [Z test for the Differences Between Two Proportions] comparing two
proportions
Researchers want to determine if there is a relationship between educational level and
whether a customer chooses a paper or plastic bag or says no preference at a grocery
, store checkout. - Answers - [Chi-Square Test for Independence] relationship between
two categorical variables
It has been reported that the average visitor from Japan spent $1953 during a trip to the
United States, while the average for a visitor from the United Kingdom was $1738. Does
the visitor from the United Kingdom spend significantly higher than a visitor from Japan?
- Answers - [Pool-Variance t Test for the Difference Between Two Means] comparing
two indepedent means
A movie complex has a sellout for three movies rated G, PG, and R that they show
simultaneously on a Friday evening. A sample of patrons from each movie is observed
to determine if they purchase snacks or do not. Could the percentage buying snacks be
the same for each movie? - Answers - [Chi-Square Test for Differences Among More
Than Two Proportions] comparing three proportions
For the top 20 top grossing US films made during the 1990's, we want to determine the
relationship between the domestic gross ticket sales and the foreign grass ticket sales
(both in millions of US dollars). - Answers - [Correlation Analysis] relationship between
two quantitative variables
We want to predict fuel consumption in billions of gallons based upon the flying hours of
turboprop general aviation aircraft. - Answers - [Simple Linear Regression] predict
dependenet variable based on one independent variable
A company uses a great deal of water in the process of making industrial milling
equipment. They want to comply with federal standards which require the average ph
level to not exceed 7.4 so they take 95 samples of water from after it goes through their
water purification system and before it reaches the settling pond and they measure the
ph level. - Answers - [t Test of Hypothesis for the Mean] one sample mean
Is there a difference in the percent of college and university professors who use
computers on the job as compared to teachers at the high school level and below? -
Answers - [Z test for the Differences Between Two Proportions] two proportions
A major brokerage firm company has an office in Miami. The manager is evaluated
based upon the number of new clients generated each quarter. Data on number of new
clients is available from 1st quarter of 1998 through the fourth quarter of 2004. We want
to predict the number of new clients in the third quarter of 2006. - Answers - [Time
Series Forecasting] independent variable is time
AAA wants to determine EPA mileage ratings of new cars based upon their weight and
whether they are standard or automatic transmission. - Answers - [Multiple Regression]
predict dependenet variable based on two independent variables
A random sample of 1000 heads of household were asked about their borrowing habits
(only for real estate and car, borrow for short term purchases such as appliances and
