MATH 221 Week 3 Quiz: Statistics for Decision-Making ( 2020)

A survey of 128 DeVry statistics students found that 83% read the announcements each week. What is the population and what is the sample? Question: In asking all 359 second graders in a school district, it is found that on average, these second graders have 2.5 pets. Is this number a parameter or a statistic and why? Question: (CO 1) Classify the data of the top grossing movies for 2017: Question: (CO 1) The data that lists the temperature in Albany, NY each day in the month of February would be classified as what type of data? Question: (CO 1) A data set that includes the years in which your hometown team won championships would be classified as what type of data? Question: (CO 1) What type of data collection might be best to estimate whether a new medicine is more effective in curing the common cold than aspirin? Question: (CO 1) What type of data collection might be best to study the effect of car crashes on humans? Question: (CO 1) You need to study the satisfaction of customers of a specific restaurant. You decide to order food and talk to those customers sitting next to you. This would most closely describe which type of sampling technique? Question: (CO 1) Which of the following type of graphs would be a Pareto chart? Question: (CO 1) In a normally distributed data set of how long customers stay in your store, the mean is 31.7 minutes and the standard deviation is 1.9 minutes. Within what range would you expect 95% of your customers to stay in your store? Question: (CO 1) Which of the following graphs would be considered normally distributed? Question: (CO 1) In a normally distributed data set with a mean of 22 and a standard deviation of 4.1, what percentage of the data would be between 17.9 and 26.1? Question: (CO 1) Which of the following would be the standard deviation of this data set: 5, 7, 6, 9, 6, 4, 4, 5, 2, 5? Question: (CO 1) What would be the mean of this data set: 8, 9, 7, 508, 7, 1, 5, 3, 4? Question: (CO 1) A pharmaceutical company wants to determine if its new medicine helps heal bruises more quickly than not treating the bruise. What type of study would be best suited to make this determination? Question: (CO 1) To gather information on customer satisfaction, a researcher goes into the local store and interviews six randomly … customers. This sampling technique is … : Question: (CO 1) What is the standard deviation and its meaning given this population of customer ages? 45, 76, 30, 22, 51, 40 , 63, 66, 41 Question: (CO 2) A random number generator is used to select a number from 1 to 100. What is the probability of selecting an odd number? Question: (CO 2) What is the sample space of flipping three coins, where H= heads and T= tails? Question: (CO 2) Consider the table below. What is the probability that the next person asked has no cats? Question: (CO 2) Consider the table below. What is the probability that the next person chosen will be in the 30-39 and 40-49 age groups? Question: (CO 2) When a children roll a die for a game, there probability of rolling a 5 is 17%. This is an example of which type of probability? Question: (CO 2) Consider the table below. What is P (over 60’)? Question: (CO 2) You are selling your product at a three-day event. Each day there is a60% chance that you will make money on the first day and lose money on the netx three days? Question: (CO 2) Consider the table below. What is the probability that a randomly … location is profitable, given that it is in the rural location. Question: (CO 2) Consider the table below. What is the probability that a randomly … product is defective, given that it is from the South production facility? Question: (CO 2) Classify these events. Selecting a king from a deck of cards, keeping it and selecting a queen from the same deck. These events would be considered: Question: (CO 2) Classify these events. A study found that people who suffer from stress are more likely to have health issues. These events would be considered: Question: (CO 2) In a survey of 320 customers, 84 say that service is poor. You select two customers without replacement to get more information on their satisfaction. What is the probability that both say service is poor? Question: (CO 2) Randomly select a customer that purchases tofu. Randomly select a customer that purchases chicken. Are these events mutually exclusive?