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A sample of 20 glass bottles of a particular type was selected, and the internal pressure strength of each bottle was determined. Consider the following partial sample information:
If a random sample of five computer power system is selected from the large number of sites in the country, what is the probability that at least three will have a high neutral to full-current load
Assume that causes of heart failure between individuals are independent. What is the probability that 4 individuals have conditions caused by outside factors?
A lot of 100 semiconductor chips contains 20 that are defective. Three are selected, at random, without replacement, from the lot. Determine the probability that all are defective.
An order for a computer can specify any one of three memory sizes, any one of two types of displays, and any one of four sizes of a hard disk, and can either include or not include a pen tablet. How
You want to determine the average number of hours worked by professors at your university per week. You want to be able to express your answer as a confidence interval, with 95% confidence (that is,
The US department of transportation maintains statistics for consumer complaints for 100,000 airline passengers. In the first nine months of 2009 consumer complaints were 0.99 per 100,000 passengers
Compare the difference in the widths of the two confidence intervals for their means.
In a normal distribution with u (mu)=90 and o (sigma)=15, find the proportion of data values between 80 and 110.
In a normal distribution find the probability expressed as a percentage that is greater than a z score of 2.33
In a normal distribution what is the proportion of area between the z scores -2.09 and +.53
The National Association of Realtors estimates that 23% of all homes purchased in 2004 were considered investment properties. If a sample of 800 homes sold in 2004 is obtained what is the probabilit
In one particular investigation, a sample of 48 shear strength observations gave a sample mean strength of 17.17 N/mm2 and a sample standard deviation of 3.28 N/mm2. Find a lower confidence bound fo
Calculate a 90% confidence interval for the true average hole diameters, and give the interpretation.
Test the hypothesis that more female's use instagram than male's. Samples of 500 female and 500 male's were chosen, and 430 females and 390 males used instagram in the past week. Use the 10% signifi
One strategy for increased SAT exam scores is to take the test, study on weak areas, then retake the test. Based on the data presented from 11 students, does it appear retaking the exam results in i
IS there evidence to suggest the proportion of males who feel air travel is now safer is greater than the proportion of females? Complete this test specifically for proportions.
Insurance for an appliance costs $30 and will pay $330 if the insured item breaks within 2 years. The insurance company estimates that 3% of the insured items will break within 2 years. Let X be the
Carnival is exploring the possibility of offering a ferry service between Hilo and Maui, provided there is enough demand. Carnival randomly interviewed 210 commuters from the two islands, and 146 of
Assume that blood pressure readings are normally distributed with a mean of 122 and 17) a standard deviation of 6.4. If 64 people are randomly selected, find the probability that their mean blood pr
Determine the sample size that would be required to estimate the true proportion of defective chips if we wanted our estimate, p^, to be within 1.25% of the true proportion, with 99% confidence.
Subjects are randomly and independently assigned to two groups where one is giving the leading product and the other given a new drug about to be released. Subjects then record the time it takes to
In 1998 20% of university undergraduate students had at least one tattoo. A health practitioner obtains a random sample of 1029 university undergraduates and finds that 230 have at least one tattoo
IS there evidence to suggest the proportion of males who feel air travel is now safer is greater than the proportion of females? Complete your analysis based on odds ratios.
A multiple choice test consists of 5 questions each with 4 possible answers. What is the probability that a student will