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To compare two kinds of front-end design, six of each kind were installed on a certain make of compact car. Then each car was run into a concrete wall at 5 miles per hour, and the following are the
Which of the following is considered a decision variable in the media selection problem of minimizing interview costs in surveying?
Use the four steps of testing hypothesis at 0.05 level of significance to test the null hypothesis Musub1-Musub2=-0.5 against the altenative hypothesis Musub1-Musub2<-0.5.
Assume that customers arrive completely randomly, one at a time, at the rate of 15 per hour. Calculate the operating characteristics of interest to the manager.
The power of this test against the alternative hypothesis that the chance the die lands with one spot showing is 13.62%, the chance the die lands with six spots showing is 19.71%, and the chances th
In the 2012 Us census, the four most populous states (CA, TX, NY, FL) had 12.1%, 8.1%, 6.3% and 6.1% of the total US population. Suppose a pollster surveys 1000 US citizens and 102 are from CA, 84 f
A random sample of 6 music majors playing song S counted the number of mistakes each made. Then these musicians played song G and the mistakes were tallied. In between playing the two songs, the stu
Suppose the second survey had 20 subjects and a sample standard devation of 9 shots. Prob. Type I error = .05 Can we supprt the claim that the variation on the second day was greater than the variat
There is a tradeoff between the cost of eroneously discarding a good lot, and the cost of warranty claims if a bad lot is sold. The next few problems refer to this scenario.
Two airlines are randomly sampled to compare the porportion of on-time flights. out of 300 flights, 73% of the flights at A were ontime, while B had 82% of 250 flights on time. find a 95% confidence
A random sample of 22 cans from Y store had a mean of $12.03 and a standard deviation of $3.86. A random sample of 25 cans from Z store had a mean of $14.05 and a standard deviation of $4.02. probab
Jorge finds that his standardized z score on an IQ is 2.0. What percentage of people did he score higher than?
The average income tax refund for 2009 tax year was $3095. Assumes the refund per person follows the normal probability distribution with a standard deviation of $922. Round all answers 4 decimal pl
Scores on a national exam assume a normal distribution with a population mean of 50 and population standard deviation of 10 points. A sample of 36 exam scores was selected from UCA with a mean score
A standardized third grade reading test, called the We Can Read Test, has a mean of 50 with a standard deviation of 10. A developmental psychologist conducts a study, where he assesses the reading a
The lengths of human pregnancies are normally distributed with a mean of 268 days and a standard deviation of 15 days. If we stipulate that a baby is premature if the length of pregnancy is in the l
Based on the U.S. Bureau of Justice data, 16% of persons arrested are women. If 400 arrest cases are randomly selected, estimate the probability to 4 decimal places that more than 70 women were arre
The life time T of a durable substance is an exponential distributed ramdom varialble with average 1.5 year (Exponential).
Find the probability of answering the first 2 questions correctly. b. find the probabiblity of answering all 5 questions correctly. c. find the probabiblity of answering at least one question correc
General Hospital has noted that they admit an average of 8 patients per hour. Define the random variable in words for this experiment. What is the probability that during the next hour fewer than 3 pa
A 95% confidence interval for the difference in proportion of registered voters that support this candidate between the northern and southern halves of the state is
Hartsfield Atlanta International Airport is the busiest airport in the U.S. averaging 2200 planes a day with a standard deviation of 75. A pilot believes that the average exceeds that and tests it u
Suppose a random smaple of size 36 is drawn from a population with a mean of 278,. If 86% of the time the sample mean is less than 280, what is the population standard deviation?
Compare and contrast a two-way ANOVA and a multivariate regression model with only two IVs?
Suppose you have variables X and Y, and you attempted to regress Y on X (i.e., predict Y from X). If you add 10 to the value of every Y data point, what will happen to the equation of the best fitti