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Suppose the proportion of female shoppers in a certain mall is 0.67. On a specific day, a store in the mall took a random sample of 180 shoppers and recorded the proportion of females in the samples. What is the standard deviation of the sampling distribution?(Use 3 decimal digits)
Results of study are summarized below. Use a 5% level of significance and test claim that opinion is independent of brand.
the mean incubation time for a type of fertilized egg kept at 100.3 f is 23 days. suppose that the incubation times are
a university found that 30 of its students withdraw without completing the introductory statistics course. assume
the average number of phone calls at a particular phone booth is 6 per hour. if someone arrives immediately ahead of
a locksmith is preparing an electronic key code of 4 integers selected from the set 0 1 2 3 4 5 6 7 8 9 without
suppose a manufacturing company makes a certain item. the time to produce each item is normally distributed around a
wetland ecologists often recommend including an island in the middle of wetlands to increase the retention time during
is it possible to calculate distribution-free confidence intervals based upon the wilcoxon two-sample test? if so what
a. Calculate degrees of freedom for this square test for goodness fit b. Perform all the calculations to complete the table.
An education expert is researching teaching methods and wishes to interview teachers from a particular school district. She randomly selects ten schools from the district and interviews all of the teachers at the selected schools.
If we wanted to shorten the interval of the estimation of the true mean of Saturday sales to a width of $600 in total, what should the size of our sample be to achieve it?
objects with masses m1 12.0 kg and m2 8.0 kg are connected by a light string that passes over a frictionless pulley
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