# The owner of a nationwide chain of shopping malls is

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14.The owner of a nationwide chain of shopping malls is interested in the buying habits, on any given day, of the peoplewho shop at the malls. Which sentence describes the best sample the owner could use to make inferences about thepopulation? A. Choose one shopping mall from the chain and survey all the people who shop there every day of the week.B. Choose one shopping mall from the chain and survey the managers of the three largest stores about the habits ofthe people who shop in their stores.C. Randomly select a sample of shopping malls from the chain throughout the nation and survey a random sample ofthe people who shop at the mall on Friday.D. Randomly select a sample of shopping malls from the chain throughout the nation and survey a random sample ofthe people who shop at the mall each day of the week.
15.A student is curious about what kind of score a person would receive on a 10-question, True-False practice test if allthe answers are guessed. The student performs a simulation of taking this practice test 100 times with theassumption that the probability of the answer being “True” is 0.5. The graph below shows how many questions werecorrect out of 10 for each of the 100 trials.A student gets back the practice test and has only 1 question correct. Based on the information from the graph, whichof the following is the most valid conclusion that the student can make?A. “True” was the answer only 10% of the time.B. “False” was the answer only 10% of the time.C. There is not enough evidence to question the student’s belief that the probability of the answer being “True” is0.5.D. There is enough evidence to question the student’s belief that the probability of the answer being “True” is 0.5. 16.A state senator requested a survey of registered voters to determine public opinion of a new law. Of the 940 voterswho responded to the survey, 61.7% were in favor of the new law, 35.1% were opposed, and the rest wereundecided. What is the margin of error of this survey with a 95% level of confidence?
17.A random sample of 108 customers was taken in a shopping mall. The mean number of purchases for this sample ofcustomers was 3.9 with a standard deviation of 1. The median was 4.4, and the mode was 4. A graph shows that thedistribution of the data is highly skewed to the left. A store manager wants to calculate the probability that acustomer will purchase at least 4 items. Which statement is true? The probability cannot be accurately determined using the mean, standard deviation, or z-score table.

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