A business research group is conducting a survey to gauge consumer sentiment in Victoria. They sampled 484 consumers and finds that 157 are optimistic about the economy. Use this information to answer questions 10 to 11 10. Compute the sample proportion of consumers who are optimistic about the economy and the standard error (round to two decimal places). 11. Construct and interpret the 90% confidence interval (round to two decimal places) for the population proportion