Find the probabilty that a randomly sampled person either uses a debit card or does not get a vanilla icecream
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george works at a local icecream shop . He samples 200 customers . He finds out that 120 use a debit card and the rest of them use cash . Also, 50 customers get vanilla icecream . Of those , 30 got vanilla iccream and used debit cards
Find the probabilty that a randomly sampled person either uses a debit card or does not get a vanilla icecream
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- How can I find the sample mean of these four scores ? 1,4,4,10Blank are more representative of a population, but blank are easier to obtainTo get from Berkeley to the San Francisco airport (SFO) one can either take a shuttle van or drive. Either way, one must cross the San Francisco Bay Bridge. The shuttle van drops its passengers at the airport departure terminal. If one drives, he or she must park in a lot near the airport, then take a parking shuttle from the parking lot to the airport departure terminal. There is a 40% chance that the Bay Bridge will be congested with traffic. If it is, it takes 1.1 hours to drive to the parking lot. If not, it takes 40 minutes to drive to the parking lot. The parking shuttle runs every 10 minutes and takes 10 minutes to get to the airport departure terminal from the parking lot. Suppose it is equally likely that one must wait 0, 1, or 9 minutes for the parking shuttle once getting to the parking lot, and that the amount of time one must wait is independent of the amount of time it takes to drive to the parking lot from Berkeley. 2, If one takes the shuttle van from Berkeley directly…
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- A marketing agency wanted to determine if a new commercial changed people's opinion about a company. They recruited n=30 participants to watch the commercial. First, everyone was givien a survey to determine their attitudes toward the company. Then, everyone watched the new commercial. Finally, they were given the same survey again and asked about their attitudes toward the comapny after seeing the commercial. The agency wanted to see if attitudes were changed by the commercial. What statistical test should they use?A nationwide job recruiting firm wants to compare the annual incomes for childcare workers in New York and Illinois. Due to recent trends in the childcare industry, the firm suspects that the that the mean annual income of childcare workers in the state of New York is greater than the mean annual income of childcare workers in Illinois. To see if this is true, the firm selected a random sample of 20 childcare workers from New York and an independent random sample of 20 childcare workers from Illinois and asked them to report their mean annual income. The data obtained were as follows. Annual income in dollars New York 46686 , 34979 , 47325 , 48892 , 51128 , 56792 , 47785 , 48995 , 57301 , 55176 , 48002 , 45718 , 50351 , 58527 , 47067 , 53699 , 54361 , 49727 , 36426 , 50870 Illinois 48009 , 46871 , 42774 , 49790 , 43163 , 45401 , 41068 , 50300 , 47064 , 42003 , 47775 , 41917…A college instructor gave identical tests to tworandomly sampled groups of 35 students. Onegroup took the test on paper and the other tookit online. Following are the test scores: Paper- 79, 75, 49, 78, 73, 81,70, 63, 79 ,65, 60, 74, 64, 64, 74, 69, 57, 65, 61, 58, 92, 71, 69, 66, 71, 68, 67, 81, 78, 80, 76, 67, 49, 56, 45, Online- 79, 75, 71, 81, 56, 72, 49, 75, 63, 81, 74, 72, 71, 73, 83, 59, 78, 65, 53, 47, 63, 82, 81, 76, 65, 82, 78, 76, 65, 72, 85, 84, 81, 50, 79, a. Can you conclude that there is a difference in themean score between the paper and onlinetesting? Use a 5% level of significance.b. Construct a 95% confidence interval for thedifference in mean scores between paper andonline testing. Please explain how to know what test needs to be performed and how to solve it using a Ti83 calculator. Thank you
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