Its a statistic problem. Show steps on how to solve ir

An experiment involves selecting a random sample of 256 middle managers for study. One item of interest is their annual income. The sample mean is computed to be $35,420, and the sample standard deviation is $2,050. What is the sample standard error of the mean? Show your answer to two decimal places (for example, 33.25) Answer. 128.13 The correct answer is: 128.13 If a random sample of 200 items is taken from a population in which the proportion of items having a desired attributed is 0.30, what is the probability the proportion of the sample will be less than or equal to 0.27? Show your answer to four decimal places (for example, 0.2578). Answer: 0.1762 See Example 75 The correct answer is: 0.1762 Statement 1: Suppose the mean balance of checking accounts at a Regions Bank is $4320, A simple random sample of 10 accounts yielded a total balance of $41.490. This means the sampling error is -$171. Statement 2. An automotive manufacturer is testing a new model and finds and claims the average mpg is 25. An industry watch group takes a simple random sample of 10 these cars and obtains average mpg of 24, This means the automotive manufacturer's claim must be incorrect. Select one: 3. Both Statements are False. b. Both Statements are True. c Only Statement 1 is true.\f