Write the null and alternative hypotheses to test each of the situations in Parts a through c below. a) An online art supply company is concerned about the timeliness of the delivery of its products. The VP of Operations and Marketing recently stated that she wanted the percentage of products delivered on time to be greater than 90%, and she wants to know if the company has succeeded. Let p be the proportion of products delivered on time. Ho: P HA : P (Type integers or decimals. Do not round.) b) A realty company recently announced that the proportion of houses taking more than five months to sell is now greater than 44%. Let p be the proportion of houses taking more than 5 months to sell. Ho: P HA: P (Type integers or decimals. Do not round.) c) A financial firm's accounting reports that, after improvements in its system, it now has an accuracy rate above 99% Let p be the accuracy rate. Ho: P HA : P (Type integers or decimals. Do not round.)