Group 1 Group 2
Leveled Practice In 6 and 7, complete each statement.
6. A study is done to compare the fuel efficiency of cars.
Cars in Group 1 generally get about 23 miles per gallon.
Cars in Group 2 generally get about 44 miles per gallon.
Compare the groups by their means. Then make an
inference and give a reason the inference might be true.
is less than the mean for
The mean for Group
Group
The cars in Group
generally are more fuel-efficient.
23 miles
per gallon
44 miles
per gallon
The cars in Group
may be smaller.

An engineer is going to redesign an ejection seat for an airplane. the seat was designed for pilots weighing between 120 lb and 161 lb. the new population of pilots has normally distributed weights with a mean of 125 lb and a standard deviation of 28.1 lb. a)if a pilot is randomly selected, find the probability that his weight is between 120 lb and 161 lb.the probability is approximately? b. if 36 different pilots are randomly selected, find the probability that their mean weight is between 120 lb and 161 lb. the probability is approximately? c. when redesigning the ejection seat, which probability is more relevant? . part (b) because the seat performance for a single pilot is more important. b. part (b) because the seat performance for a sample of pilots is more important. c. part (a) because the seat performance for a sample of pilots is more important. d. part (a) because the seat performance for a single pilot is more important.