suppose in july of 2008, the true proportion of u.s. adults that thought unemployment would increase was 47%. in november of 2008, the same question was asked to a simple random sample of 1000 u.s. adults and 440 of them thought unemployment would increase. can we conclude that the true proportion of u.s. adults that thought unemployment would increase in november is less than the proportion in july? use a 5% significance to tes