In order to determine the average weight of carry-on luggage by passengers on a particular airplane,...
In order to determine the average weight of carry-on luggage by passengers on a particular airplane, a sample of 22 pieces of carry-on luggage was weighed. The average weight was 9 kg. It is known that the weight of carry-on luggage is normally distributed and that historical data has shown the standard deviation is 3.45 kg. Determine the critical value for the test statistic (z or t) needed to build an 80% confidence interval for the mean. State the positive value exactly as found from the tables (2 decimal places).
Homework Answers
Add Answer to:
In order to determine the average weight of carry-on luggage by
passengers on a particular airplane,...
QUESTIONS 1 points Save Ans To determine the average weight of carry-on luggage by passengers in...
QUESTIONS 1 points Save Ans To determine the average weight of carry-on luggage by passengers in airplanes, a sample of 35 pieces of carry-on luggage was weighed. The average weight was 28 pounds. Assume that we know the standard deviation of the population to be 6 pounds. Determine a 97% confidence interval estimate for the mean weight of the carry-on luggage. Provide the lower limit of the confidence interval. QUESTION 9 points Save Answer A random sample of 20 students...
Because of safety considerations, in May 2003 the Federal Aviation Administration (FAA) changed its guidelines for...
Because of safety considerations, in May 2003 the Federal Aviation Administration (FAA) changed its guidelines for how small commuter airlines must estimate passenger weights. Under the old rule, airlines used 180 pounds as a typical passenger weight (including carry-on luggage) in warm months and 185 pounds as a typical weight in cold months. A journal reported that an airline conducted a study to estimate average passenger plus carry-on weights. They found an average summer weight of 183 pounds and a...
Airlines compute the weight of outbound flights using either standard average weights provided by the Federal...
Airlines compute the weight of outbound flights using either standard average weights provided by the Federal Aviation Administration (FAA) or weights obtained from their own sample surveys. The FAA standard average weight for a passenger’s carry-on items (personal items plus carry-on bags) is 16 pounds. Many airline companies have begun implementing fees for checked bags. Economic theory predicts that passengers will respond to the increase in the price of a checked bag by substituting carry-on bags for checked bags. As...
Airlines compute the weight of outbound flights using either standard average weights provided by the Federal...
Airlines compute the weight of outbound flights using either standard average weights provided by the Federal Aviation Administration (FAA) or weights obtained from their own sample surveys. The FAA standard average weight for a passenger's carry-on items (personal items plus carry-on bags) is 16 pounds. Many airline companies have begun implementing fees for checked bags. Economic theory predicts that passengens will respond to the increase in the price of a checked bag by substituting carry-on bags for checked bags. As...
Historically, the population of wolves in Canada have been found to have an average adult weight...
Historically, the population of wolves in Canada have been found to have an average adult weight of 38.9 kilograms. The Canadian Wildlife Service believes that due to climate change, this may have increased. A random sample of 12 wolves is captured and weighed and the following results are obtained. Assume that the weights are normally distributed: 44.8, 40.7, 42.6, 46.8, 48.7, 35.4, 38.9, 39.5, 38.3, 48.9, 48.4, 38.4. At a 0.05 significance level, test the hypothesis that the average weight...
A random sample of 57 children with working mothers showed that they were absent from school an average of 5.3 days per term with a standard deviation of 1.8 days. If days absent follows a normal dist...
A random sample of 57 children with working mothers showed that they were absent from school an average of 5.3 days per term with a standard deviation of 1.8 days. If days absent follows a normal distribution, determine the critical value for the test statistic (z or t) needed to build a 98% confidence interval for the average number of days absent per term for all children. State the positive value only exactly as found in the table (3 decimal...
In order to set reasonable fund-raising targets, a charitable organization wishes to know the average monthly...
In order to set reasonable fund-raising targets, a charitable organization wishes to know the average monthly income of their members. National data suggest incomes should be normally distributed with a standard deviation of σ=221 dollars. If 91 members are randomly selected and their average monthly income found to be x ¯ = 2270 dollars, find the following. Round your answers to two decimal places. a) The critical value at the 90% confidence level is zcrit = _______ b) A 90%...
5. An efficiency expert wants to determine the average amount of time it takes a particular pit crew to change a set of tires on a race car. The expert had the pit crew change a set of tires 10 times...
5. An efficiency expert wants to determine the average amount of time it takes a particular pit crew to change a set of tires on a race car. The expert had the pit crew change a set of tires 10 times, and found that the sample mean of those times is 20 seconds and their sample standard deviation was 12.2 seconds (a) (5 points) State an appropriate interval estimator for the true average amount of time it would take the...
of 2.33 on a one tailed test, then the conclusion 26. Given a test statistic of...
of 2.33 on a one tailed test, then the conclusion 26. Given a test statistic of 2.09 paired with a critical z-score a) fail to reject Ho at α-1% At a 95% confidence interval, how often would we expect μ to fall outside the interval a) 95% 27. We are allowed to use the normal distribution if a) σ is known 28. When we determine a p-value for an h a) a 29. What action will cause the confidence interval...
21. In a certain chemical process, it is very important that a particular solution that is...
21. In a certain chemical process, it is very important that a particular solution that is to be used as a reactant have a pH of exactly 8.2. A method for determining pH that is available for solutions of this type is known to that are normally distributed with a mean equal to the actual pH. Suppose 10 ylelded the following pH values: 8.18,8.21, 8.17,8.22, 8.16, 8.16, 8.17, 8.19, give 8.15, 8.18 Fill in the blanks. Use ? = 0.05....
QUESTIONS 1 points Save Ans To determine the average weight of carry-on luggage by passengers in airplanes, a sample of 35 pieces of carry-on luggage was weighed. The average weight was 28 pounds. Assume that we know the standard deviation of the population to be 6 pounds. Determine a 97% confidence interval estimate for the mean weight of the carry-on luggage. Provide the lower limit of the confidence interval. QUESTION 9 points Save Answer A random sample of 20 students...
Airlines compute the weight of outbound flights using either standard average weights provided by the Federal Aviation Administration (FAA) or weights obtained from their own sample surveys. The FAA standard average weight for a passenger's carry-on items (personal items plus carry-on bags) is 16 pounds. Many airline companies have begun implementing fees for checked bags. Economic theory predicts that passengens will respond to the increase in the price of a checked bag by substituting carry-on bags for checked bags. As...
5. An efficiency expert wants to determine the average amount of time it takes a particular pit crew to change a set of tires on a race car. The expert had the pit crew change a set of tires 10 times, and found that the sample mean of those times is 20 seconds and their sample standard deviation was 12.2 seconds (a) (5 points) State an appropriate interval estimator for the true average amount of time it would take the...
of 2.33 on a one tailed test, then the conclusion 26. Given a test statistic of 2.09 paired with a critical z-score a) fail to reject Ho at α-1% At a 95% confidence interval, how often would we expect μ to fall outside the interval a) 95% 27. We are allowed to use the normal distribution if a) σ is known 28. When we determine a p-value for an h a) a 29. What action will cause the confidence interval...
21. In a certain chemical process, it is very important that a particular solution that is to be used as a reactant have a pH of exactly 8.2. A method for determining pH that is available for solutions of this type is known to that are normally distributed with a mean equal to the actual pH. Suppose 10 ylelded the following pH values: 8.18,8.21, 8.17,8.22, 8.16, 8.16, 8.17, 8.19, give 8.15, 8.18 Fill in the blanks. Use ? = 0.05....
Most questions answered within 3 hours.
-
2. (1.5pt) Calculate [ClO-] in a 6.00% bleach solution. A 6.00%
bleach solution contains 6.00g of...
asked 50 minutes ago -
Protons in cosmic rays have been observed with kinetic energies
as large as 1.0×1020eV.
How fast...
asked 2 hours ago -
How do you explain that it is not fair for teachers to verbally
abuse you over...
asked 1 hour ago -
Ang Electronics, Inc., has developed a new HD DVD. If the HD DVD
is successful, the...
asked 2 hours ago -
which of these substances cannot behave as a lewis base in an aq
solution
a- Co...
asked 2 hours ago -
Below are some of Toyota’s (an automotive manufacturer) costs to
manufacture a car: I. Depreciation of...
asked 2 hours ago -
A random sample of 40 cups of coffee from a vending machine had
a sample mean...
asked 3 hours ago -
The mercury in a fish sample is determined to be 1.80, 1.58 and
1.64 ppm. Calculate...
asked 2 hours ago -
Suppose a photon is equally likely to be found anywhere in an
interval of 28.5 cm...
asked 3 hours ago -
Suppose the following is a divide-and-conquer algorithm for some
problem.
"Make the input of size n...
asked 3 hours ago -
Calculate the pH of the resulting solution if 15.0 mL of 0.150 M
HCl(aq) is added...
asked 3 hours ago -
How many moles of sulphur hexaflouride are present in 3.64 x 10^21
molecules of this compound?
asked 3 hours ago