BNAL QUIZ REVIEW 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
another 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 - C. Two sample test for means-
independent
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 - G. One Way
Analysis of Variance
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 - D. Two sample test for means - paired
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 - E. Two sample test for proportions
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 - C. Two sample test for means- independent
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 - F. Chi square test for homogeneity of proportions
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 but before it reaches the settling pond and they measure the
ph level. - Answers - A. One sample test for a mean
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
another 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 - C. Two sample test for means-
independent
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 - G. One Way
Analysis of Variance
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 - D. Two sample test for means - paired
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 - E. Two sample test for proportions
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 - C. Two sample test for means- independent
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 - F. Chi square test for homogeneity of proportions
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 but before it reaches the settling pond and they measure the
ph level. - Answers - A. One sample test for a mean
