If you were to draw 15 random samples of 100 residents in a city you may get 15 different mean values simply by chance. These expected differences across samples may be defined as: a. a statistical effect b. sampling error c. random error d. probability

Given a normal population whose mean is 435 and whose standard deviation is 37, find each of the following:   A. The probability that a random sample of 3 has a mean between 442 and 448.   Probability =  B. The probability that a random sample of 18 has a mean between 442 and 448.   Probability =  C. The probability that a random sample of 22 has a mean between 442 and 448.   Probability =

c. What is the likelihood of selecting a sample with a mean of at least $139,000? Note: Round your value to 2 decimal places and final answer to 4 decimal places. Probability d. What is the likelihood of selecting a sample with a mean of more than $127,000? Note: Round your value to 2 decimal places and final answer to 4 decimal places. Probability e. Find the likelihood of selecting a sample with a mean of more than $127,000 but less than $139,000. Note: Round your z-value to 2 decimal places and final answer to 4 decimal places

For each situation given below, do the following: A) Decide if the random variable is Poisson (or reasonably close to Poisson). Explain your reasoning. B) If it is Poisson, find the mean and variance. C) If it is Poisson, find the probabilities indicated in the problem. 1. During the lunch rush, cars arrive at the McDonald's drive-thru line at a rate of 58 cars per hour. The arrivals are random. a. The probability of 0 cars arriving in the next half hour. b. The probability of more than 60 cars arriving in the next half hour. 2. You work for a home security sales team going door-to-door. You average 4.3 sales per day. a. The probability of no sales in a given day. b. The probability of more than 25 sales during a workweek (5 days). c. The probability of at least 250 sales over a 12 workweek summer. 3. Br. Cox plants a fixed number of bean seeds in each of his garden boxes. He is interested in the number that germinate in a given box. On average, 23 seeds germinate in each box. a. The…