The hypotheses, Null and Alternative, are basically statements about which of the following? * O both population and sample parameters O sample statistics O population parameters O sample parameters
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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?Suppose you work for a large cell phone distributor, and want to examine which brands of cell phones Canadians prefer around the country. Use the following example dataset regarding the number of users (in millions) based on phone preference and geographical location in Canada. Using this information, and assuming the sample represents the population of Canada perfectly, select all the statements below that are correct. |iPhone AndroidNeither 0.7 0.3 Ontario Quebec British Columbia Other 0.2 0.4 0.4 0.1 0.2 0.3 0.9 0.2 0.4 0.1 P(Ontarid Neither) -0.267 OP(Ontario)and P(British Columbia) are independent events. If a user was known to be from Quebec, the chance of them not using an iPhone is 50%. UP(Other) and P(Android) are not independent events. If a random Android user was selected, there is an approximately 23% chance that they are from British Columbia.Sampling error often explains why research findings are not generalizable to a whole population. O TrueO False
- The Bureau of Labor Statistics reports that the official unemployment rate for Black people was 10.4% and 4.7% for White people in February 2015. Select all correct answers for this question. O The samples of white and black people are independent. The explanatory variable is the unemployment rate. The response variable is the unemployment rate. The response variable is race.When is it appropriate to use a pooled sample test?Which statement is NOT a possible statement for an alternative hypothesis? O population characteristic = hypothesized value O population characteristic hypothesized value O population characteristic hypothesized value #
- Does more education lower a person’s level of prejudice? The number of years of education and the score on a prejudice test for ten people is given in the following table. Higher scores on the test indicate more prejudice. Years of Education: 12, 15, 14, 13, 18, 10, 16, 12, 10, 4 Score of Prejudice Test: 1, 6, 2, 3, 2, 4, 1, 5, 5, 10 Conduct a hypothesis test to determine if there is a significant linear correlation between the two variables. If there is a significant linear correlation between the variables, determine the regression equation. There is a significant correlation between the variables and the regression equation is y' = 10.5 - 0.532x There is a significant correlation between the variables and the regression equation is y' = - 0.532 + 10.5x There is not a significant correlation between the variables, so the regression equation should not be determined. There is a significant correlation between the variables and the regression equation is y' = 16.509 - 1.054x4. Describe the process of statistical inference.Null and alternative hypotheses are statements incorporate a. population parameters. b. sample parameters. c. sample statistics. d. either population parameters or sample statistics.
- What is a semi-structural interview? Describe and provide examples of four types of scales. Define validity and reliability in research. What are the characteristics/determinants of validity and reliability? Provide examples of validity and reliability in quantitative and qualitative research. Provide examples of probability and nonprobability sampling. What is sampling in qualitative and quantitative research? How are they different?We would like to investigate if there is a difference in mean coffee consumption frequency between students at Rutgers, Princeton, and the University of Michigan. What test would we likely conduct? Independent samples t-test One Sample z-test Paired samples t-test One Way ANOVAA random sample of employees participating in a company fitness program were asked how many days they logged an exercise activity in the past month. Their responses are reported in the histogram below.Based on the histogram above, what is the class width? Clas width = ? Days What is the sample size? Sample size = ? employees
