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Three bombers are attempting to hit a target deep behind enemy lines. The bombers success rates for bomber A, B and C are: 30%, 45% and 60% respectively. Find the probability that:
The following are body mass index (BMI) scores measured in 12 patients who are free of diabetes and participating in a study of risk factors for obesity. Body mass index is measured as the ratio of
Writing a Claim: A taxi cab company claims that the mean travel time between two destinations is about 21 minutes. You work for a bus company and want to reject this claim. How would you write the n
A politician claims that she will receive 60% of the vote in an upcoming election. The results of a properly designed random sample of 100 voters showed that 55 of those sampled will vote for her. I
A charity solicits donations by phone. From long experience the charity's director reports that 60 percent of the calls will result in refusal to donate, 30 percent will request more information via
Poll of 1000 adults.92% of H.S. degree or less said "certain" or "little doubt". of those with with some college, college grad, and postgrad the percentages for "certain" or "little doubt" were 90,
Womens heights are normally distributed with a population mean of 63.6 inches and a population standard deviation of 2.5 inches. A club set up for women of average height. If requirements are set t
There are two machines that break down with a probability of 0.2 (each) per day. This is a binomial probability of 0, 1 or 2 failures per day with probabilities of .64, .32 and .04 respectively. You
The total maintenance cost (including downtime cost) in the case of two repairmen on duty is:
Approximately 30% of obese patients develop diabetes. If a physician sees 10 patients who are obese, a) What is the probability that half of them will develop diabetes?
An agent for a residential real estate company in a large city would like to be able to predict the monthly rental cost of apartments based on the size of the apartment.
A survey of 85 families showed that 36 owned at least one DVD player. Find the 99% confidence interval estimate of the true proportion of families who own at least on DVD player.
At the .05 level of significance, is there evidence to suggest that the mean life length of the batteries produced by this manufacturer is more than 400 hours?
Serum ferritin is used in diagnosing iron deficiency. In a study conducted recently researchers discovered that in a sample of 28 elderly men the sample standard deviation of serum ferritin was 52.6
A lawyer researched the average number of years served by 45 different justices on the Supreme Court. The average number of years served was 13.8 years with a standard deviation of 7.3 years. What i
Police investigating an accident measure skid marks from car A to be 37.6 m before its impact with car B.
A confidence interval of 90% was used to estimate the proportion of customers who buy at least two items during their shopping mall experience. A random sample of 200 customers produced the followin
Please do a z-test: The Water and Juices store stated that the average consumption of water per day was 123 gallons. To test the hypothesis that this figure may no longer be true, a researcher rand
The loan officer rates applicants for credit. Ratings are normally distributed. The mean is 240 and the standard deviation is 60. If 49 applicants are randomly chosen, what is the probability that
Glucose levels in patients free of diabetes are assumed to follow a normal distribution with a mean of 120 and a standard deviation of 16. a) What proportion of patients have glucose levels exceedin
If a correlation coefficient of r = 0.642 was found between two variables in a sample of paired data that were measured in feet, the value of r would change by a factor of twelve if the data were c
Many people think that a national lobby's successful fight against gun control legislation is reflecting the will of a minority of Americans. A random sample of 4,000 citizens yielded 2,250 who are
The lifetime of zzz batteries are normally distributed with a mean of 270 hours and a standard deviation of 10n hours. Find the number of hours that represent the 4oth percentile.
Suppose the mean and standard deviation are 74.04 and 9.75, respectively. If we assume that the distribution of ages is mound-shaped and symmetric
The responses of sample of 1040 people who were asked if they air quality in their community is better or worse than it was 10 years ago are showing below: Better: 350 ; worse: 450; same: 240. Find