Please highlight the answers - short explanation.

Part A;

Marketing companies are interested in knowing the population percent of women who make the majority of household purchasing decisions. Suppose a marketing company did do a survey. They randomly surveyed 2130 households and found that in 120 of themr the woman made the majority of the purchasing decisions. We are interested in the population proportion of households where women make the majority of the purchasing decisions. Identify the following. [Enter exact numbers as integers, fractions, or decimals.) {all x E {h] n |:| {c} p\" |:| A poll of 1,200 voters asked what the most significant issue was in the upcoming election. Sixty-five percent answered the economy. We are interested in the population proportion of voters who feel the economy is the most important. Define the random variable X in words. O the proportion of voters sampled who said the economy is the most important issue in the upcoming election O the total number of voters in the sample O the total number of voters O the number of voters who were polled about the upcoming election O the number of voters who said the economy is the most important issue in the upcoming electionA poll of 1,200 voters asked what the most significant issue was in the upcoming election. Sixty-five percent answered the economy. We are interested in the population proportion of voters who feel the economy is the most important. What would happen to the confidence interval if the level of confidence were changed from 90% to 95%? O The confidence interval would become wider because it would have to account for more variation. The confidence interval would become wider because it would have to account for less variation. O The confidence interval would become narrower because it would have to account for less variation. O The confidence interval would become narrower because it would have to account for more variation. O There would be no change.Five hundred twelve (512) homes in a certain southern California community are randomly surveyed to determine if they meet minimal earthquake preparedness recommendations. One hundred seventy-one (171) of the homes surveyed met the minimum recommendations for earthquake preparedness and 341 did not. Find the confidence interval at the 90% confidence level for the true population proportion of southern California community homes meeting at least the minimum recommendations for earthquake preparedness. (Round your answers to three decimal places.)For a binomial experiment with / successes out of n trials, what value do we use as a point estimate for the probability of success p on a single trial? p