A sample of 22 account balance of a credit company showed a mean customer balance of 4,300 but the marketing manager claimed that the mean balance for the population was $4450. The marketing manager did not have the population standard deviation but the sample standard deviation was found to be $400. Use the p-value approach to conduct a full hypothesis test(all steps) that can be used to determine whether the mean of all account balance is significantly different from $4440. Let a= .05