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a coffee shop sells on the average 320 cups of coffee per day with a standard deviation of 40 after advertising they
in order to compare the yearly incomes in two professions a survey was made among 100 men in each in one sample the
records show that in a random sample of 100 hours a machine produced an hourly average of 678 articles with a standard
1 a derive the mle of a2nbspfor the normal distribution assumingnbspmu is knownb is it unbiased2 as n 1 delegates
1 why is it so hard to distinguish among the effects of culture race and ethnicity in our research2 why should we
1 what are some difficulties that scientists have had in categorizing people by race and in defining race2 why is
a random sample of 100 workers in one large plant took an average of 12 minutes to complete a task with a standard
two samples of 100 seedlings were grown with two different fertilizers one sample had an average height of 10 inches
a random sample of 60 students was taken in two different universities the first sample had an average mark of 77 and a
1 100 cars on a thruway were clocked at an average speed of 69 mph with a standard deviation of 4 mph construct a 95
in a random sample of 10 football players the average age was 27 and the sum of squared deviations was 300 in a random
in a random sample of tires produced by a certain company 20 did not meet the companys standards construct a 95
1 by talking to 15 voters you discover that only 3 favor a certain candidate construct a 95 confidence interval for the
in a survey of us consumer intentions 498 families in a random sample of 2500 indicated that they intended to buy a new
a farmer has 9 wheat fields planted the distribution of yield from each field has a mean of 1000 bushels and variance
1 suppose gallup takes a poll of 1000 voters from a population which is 56 percent democratic letting p be the sample
1 what is the chance that of the first 100 babies born in the new year more than 60 will be boys2 what is the chance
1 what are the advantages of longitudinal designs and cross-sectional designs2 how does a panel study differ from a
an anthropologist measured the heights in inches of a random sample of 100 men from a certain population and found the
a research study examines the consumption expenditures in thousands of dollars of a random sample of 50 american
1 the reaction times of 150 randomly selected drivers were foun4 to have a mean of 83 sec and standard deviation of 20
1 what is the probability that a statistician who constructs 20 independent 95 confidence intervals will erra once as
1 why do open-ended questions provide more information to survey researchers than closed-ended questions what drawbacks
compare the strengths of the linear relationships indicated by the given population correlation coefficients by putting
the following data give the number of hours each of six students in a statistics class spent studying and the students