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1 describe the patterns displayed by the individual sampling distributions then describe how the pattern changes as the
1 plot the sample variances against the sample sizes with sample size on the horizontal axis what pattern do you see
what is the approximate slope of the line fit through the plot of variance versus reciprocal of sample size can you see
the above analysis should suggest that the slope of the line relating variance to 1sample size is
a two-standard-deviation interval is called the margin of sampling error or the margin of error or the sampling error
revisit the scenario at the beginning of this lesson for a gallup poll a typical sample size is 1000 for the
1 does the concept of margin of error make sense if the data in a poll do not come from a random sample explain2 write
find examples of polls published in the media if the margin of error is given ver ify that it is correct if the margin
1 conduct the experiment described in the scenario with 40 students from your class adding other people if necessary to
use the completed chart to answer these questionsa according to the 1990 us census about 30 of people aged 25 to 44
based on the chart your class has completed it is plausible that 60 is the percentage of the population that are
people often complain that election polls cannot be right because they personally were not asked how they were going to
this activity used 90 confidence intervals because it is easy computationally to find the bottom 5 and the top 5 of a
the following scenario applies to the remaining exercises in given exercise we presented a two-way table of counts for
the goal is to estimate the average length of the n strings in the bag the instructor is holdling the sampling will be
selection by random numbers a lay the strings out on a table and number them from 1 tonb select 10 strings by choosing
data analysisa construct a dot plot or stem plot of the averages from the sampling by touchb construct a dot plot or
look at a map of your state or a neighboring state that has the lakes marked in a visible way an environmental
the sampling by touch method is said to suffer from selection bias in that the longer strings get chosen more often
suggest other situations in which selection bias could be important discuss how one might get unbiased data in these
collecting the datausing the rectangle sheet from the earlier random rectangles activity and a random number table draw