An economist is interested in studying the incomes of consumers in a particular region. the population standard deviation is known to be $1,000. a random sample of 50 individuals resulted in an average income of $15,000. what total sample size would the economist need to use for a 95% confidence interval if the width of the interval should not be more than $100?

Match each event to its effect on the equilibrium interest rate and the amount of investment in the loanable funds market. higher interest rate, greater investment higher interest rate, less investment lower interest rate, less investment lower interest rate, greater investment immediate consumer gratification is no longer preferred by people. an efficient new source of energy effectively increases the return on owning a factory. a wave of retirees stops working and begins drawing on retirement savings.