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It's believed that as many as 24%of adults over 50 never graduated from high school. We wish to see if this percentage is the same among the 25 to 30 age group.
a) How many of this younger age group must we survey in order to estimate the proportion of non-grads to within 8% with 90% confidence?
Sketch the distributions involved, and (c) explain your answers to someone who has never had a course in statistics.
Suppose that a certain college class contains 45 students. Of these, 26 are sophomores, 25 are chemistry majors, and 7 are neither. A student is selected at random from the class.
a random sample of 144 observations has a mean of 20 a median of 21 and a mode of 22. the population standard deviation
a. what is the point estimate of the population mean? b. what is the point estimate of the population standard deviation?
on average there is one flaw per 1000 feet of pipe. what is the probability that there is exactly one flaw in only
in a study of 420006 cell phone users 164 subjects developed brain cancer. test the claim that cell phone users
Suppose a consumer group suspects that the proportion of households that have three cell phones is 30%. A cell phone company has reason to believe that the proportion is 30%. Before they start a big advertising campaign, they conduct a hypothesis ..
assume that the data has a normal distribution and the number of observations is greater than fifty. find the critical
recently research physicians at mountain states have developed a surgery process they believe will reduce the average
Douglas Boats is a supplier of boating equipment for the states of Oregon and Washington.
1. A social scientist would like to use a pictogram in comparing the number of violent crimes against persons in 2006 with the comparable figure for 1960. Consider- ing that she can select from a wide variety of symbols to demonstrate these freque..
The power transmission cable has a weight per unit length of 15 lb/ft . If the lowest point of the cable must be at least 90 ft above the ground, determine the maximum tension developed in the cable and the cable's length between A and B
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