United States Postal Service (USPS). Track & trace the parcel from USA sent by USPS

The United States Postal Service (USPS) delivered 32% of all packages shipped in the US in the year 2022. In 2015, USPS delivered 40% of all packages.Which of the following statements about the standard deviation of the sample proportion (that is, σp̂) are correct? Select all that apply.a. The standard deviation of the sample proportion for a sample of 100 packages in 2022 will be smaller than for a sample of 400 packages in 2022.b. The standard deviation of the sample proportion of packages shi