4/15/25, 10:54 BUAL 2600 Final |
AM
BUAL 2600 FINAL EXAM QUESTIONS AND ANSWERS
WITH COMPLETE SOLUTIONS
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The population of lengths of 1.00
aluminum- coated steel sheets is
normally
distributed with a mean of 30.05
inches and a standard deviation of
.2 inches.
What is the probability that a sheet
selected at random will be less than
31 inches long?
The population of lengths of .1574
aluminum- coated steel sheets is
normally
distributed with a mean of 30.05
inches and a standard deviation of
.2 inches.
What is the probability that a sheet
selected at random from the
population is between 30.25 and
30.65 inches long?
1/
9
, 4/15/25, 10:54 BUAL 2600 Final |
AM
Recently, a case of food poisoning [.059,.122]
was
traced to a particular restaurant chain. pˆ=29/319=.0909p^=29/319= .0909
The source was identified, and
corrective actions were taken to [pˆ±zα/2√(pˆ(1−pˆ)/n)]=[.0909±1.96√(.0909×.909/319)]=[.0909±.0315]=[.059, .122]
make sure that the food poisoning
would not reoccur.
Despite the response from the
restaurant chain, many consumers
refused to visit the restaurant for
some time after the event. A
survey was conducted three
months after the food poisoning
occurred, with a sample of 319
former customers contacted. Of the
319
contacted, 29 indicated that they
would not go back to the restaurant
because of the potential for food
poisoning.
Construct a 95 percent confidence
interval for the true proportion of the
market who still refuse to visit any of
the restaurants in the chain three
months after the event.
p = sample proportion
(success/total) n = sample size
confidence interval formula
z = critical value
The flying time of a drone airplane .1587
has a normal distribution with
mean 4.76 hours and standard
deviation of .04 hours. What is the
probability that the drone will fly
more than 4.80 hours?
The success rate of an experimental [.2260, .3910]
medical procedure is 37 per 120
cases in a sample. Find a 95
percent confidence
interval for the actual success
proportion of the procedure.
The population of lengths of .0668
aluminum- coated steel sheets is
normally
distributed with a mean of 30.05
inches and a standard deviation of
.2 inches.
What is the probability that a sheet
selected at random will be less than
29.75 inches long?
In a randomly selected group of [.243, .311]
650 automobile deaths, 180 were
alcohol related. Construct a 95
percent confidence interval for the
true
proportion of all automobile
accidents caused by alcohol.
The state agriculture department [.048, .219]
tested 203 fuel samples across the
state in 2009
for accuracy of the reported octane
2/
9
AM
BUAL 2600 FINAL EXAM QUESTIONS AND ANSWERS
WITH COMPLETE SOLUTIONS
Leave the first rating
Save
The population of lengths of 1.00
aluminum- coated steel sheets is
normally
distributed with a mean of 30.05
inches and a standard deviation of
.2 inches.
What is the probability that a sheet
selected at random will be less than
31 inches long?
The population of lengths of .1574
aluminum- coated steel sheets is
normally
distributed with a mean of 30.05
inches and a standard deviation of
.2 inches.
What is the probability that a sheet
selected at random from the
population is between 30.25 and
30.65 inches long?
1/
9
, 4/15/25, 10:54 BUAL 2600 Final |
AM
Recently, a case of food poisoning [.059,.122]
was
traced to a particular restaurant chain. pˆ=29/319=.0909p^=29/319= .0909
The source was identified, and
corrective actions were taken to [pˆ±zα/2√(pˆ(1−pˆ)/n)]=[.0909±1.96√(.0909×.909/319)]=[.0909±.0315]=[.059, .122]
make sure that the food poisoning
would not reoccur.
Despite the response from the
restaurant chain, many consumers
refused to visit the restaurant for
some time after the event. A
survey was conducted three
months after the food poisoning
occurred, with a sample of 319
former customers contacted. Of the
319
contacted, 29 indicated that they
would not go back to the restaurant
because of the potential for food
poisoning.
Construct a 95 percent confidence
interval for the true proportion of the
market who still refuse to visit any of
the restaurants in the chain three
months after the event.
p = sample proportion
(success/total) n = sample size
confidence interval formula
z = critical value
The flying time of a drone airplane .1587
has a normal distribution with
mean 4.76 hours and standard
deviation of .04 hours. What is the
probability that the drone will fly
more than 4.80 hours?
The success rate of an experimental [.2260, .3910]
medical procedure is 37 per 120
cases in a sample. Find a 95
percent confidence
interval for the actual success
proportion of the procedure.
The population of lengths of .0668
aluminum- coated steel sheets is
normally
distributed with a mean of 30.05
inches and a standard deviation of
.2 inches.
What is the probability that a sheet
selected at random will be less than
29.75 inches long?
In a randomly selected group of [.243, .311]
650 automobile deaths, 180 were
alcohol related. Construct a 95
percent confidence interval for the
true
proportion of all automobile
accidents caused by alcohol.
The state agriculture department [.048, .219]
tested 203 fuel samples across the
state in 2009
for accuracy of the reported octane
2/
9
