In a poll of 1000 american adults conducted on august 5-9, 2010, 44% (p¯=0.44) of respondents approve the job that president barack obama was doing handling the economy. the goal is to construct a 90% confidence interval for the percentage (p) of american adults who approved of barack obama's handling of the economy around the period the poll was conducted. the standard error (se) of p¯p¯ is

(a) 0.016
(b) 0.44
(c) 0.0002
(d) 0.0004

You were told that the amount of time lapsed between consecutive trades on the new york stock exchange followed a normal distribution with a mean of 15 seconds. you were also told that the probability that the time lapsed between two consecutive trades to fall between 16 to 17 seconds was 13%. the probability that the time lapsed between two consecutive trades would fall below 13 seconds was 7%. what is the probability that the time lapsed between two consecutive trades will be between 14 and 15 seconds?