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from a random sample of 41 teens it is found that on average they spend 318 hours each week online with a standard
the table shows the results of a survey in which400nbspadults from the east400nbspadults from the south400nbspadults
one study based on responses from 1 013 randomly selected teenagers concluded that 43 of teenagers cite grades that
for a population of individuals that has a standard deviation of 10 what is the standard error of the mean for samples
if the coefficient of determination is 0738 what percentage of the data about the regression line is
in a survey ofnbsp3153nbspadultsnbsp1407nbspsay they have started paying bills online in the last year construct a 99
in a pre-election poll a candidate for district attorney receives 379 of 750 votes assuming that the people polled
in a survey of women in a certain country ages 20-29 the mean height wasnbsp653nbspinches with a standard deviation
suppose a retailer claims that the average wait time for a customer on its support line isnbsp179nbspseconds a random
the caloric consumption of 44 adults was measured and found to average 2113 assume the population standard deviation is
question 1find the area between -88 standard deviations below the mean and 235 standard deviations above the mean
the equation used to predict how long a cold will last is y-18 009x1 32x2 - 19x3 where x1 is persons temperature on
a manufacturer of cereal has a machine that when working properly puts 20 ounces of cereal on average into a box with a
determine the sample size needed to construct a 90 confidence interval to estimate the average gpa for the student
a national air traffic control system handled an average of 47556 flights during 28 randomly selected days in a recent
the distribution of heights of adult american women is approximately normal with a mean of 64 inches and standard
a random sample ofnbsp19nbspcollegenbspmens basketball games during the last season had an average attendance
compute the probability for a random variable x with micro10 and sigma2 calculate
according to a research institution the average hotel price in a certain year was 9536 assume the population standard
a professional baseball pitcher takes 1566 seconds to throw each pitch on average assume the pitchers times per pitch
during the winter ofnbsp2008-2009 the average utility bill for residents of a certain state was 173nbspper month a
determine the sample size n needed to construct a 99 confidence interval to estimate the population mean when sigma24
determine the margin of error for an 80 confidence interval to estimate the population mean when s 36 for the sample
advertisements suggest that a new window design can save 400 per year in energy cost over its 30-year life at an
you have an opportunity to buy a bond with a face value of 10000 and coupon rate of 14 payable semi-annually note