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According to a national census for a particular countw, the proportion of families with three or more children (aged less than 25) declined from 38% in 1961 to 19% in 2011. Suppose we estimate that this proportion is 17.3% this year. In order to market products to large families, we randomly select 2500 families in this nation for a survey. Complete parts (a) through (d) below. a) What is the expected proportion of families with three or more children in our sample? The expected proportion is %. (Type an integer ora decimal. Do not round.) b) In our sample, we nd 18.9% of the families have three or more children. What is the probability of a proportion as high as 18.9% or higher in the sample it our estimate of 17.3% in the population is correct? The probability is D. (Round to four decimal places as needed.) c) Comment on whether the survey result casts doubt on the population estimate. Since the probability V very small (less than 0.05), it V cast doubt on the estimate. d) Suppose we had surveyed a random sample of only 400 families instead of 2500 and had gotten the same result: 18.9% of the sample had three or more children. Comment on whether this result from a smaller sun/ey casts doubt on the population estimate. The probability is . Since this i very small (less than 0.05), it V cast doubt on the estimate. (Round to four decimal places as needed.)