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1) A cruise firm is exploring the possibility of offering a ferry service between Pamban Island and Mannar Island, provided there is sufficient demand to make it feasible. The firm randomly interviewed 210 commuters from the two islands, and 146 of them indicated they would patronize the ferry service instead of the current air taxi service. Estimate the population proportion p of commuters from the two islands who would prefer the ferry service. Construct a 95% confidence interval for p. 2) A firm manufacturing microchips purchases electronic chips from a supplier who claims that his chips are defective only 5% of the time. Determine the sample size that would be required to estimate the true proportion of defective chips if we wanted our estimate, p^, to be within 1.25% of the true proportion, with 99% confidence. 3) More than 80% of retired Italians say that spending time with family and friends is their primary activity. However, approximately 50% say that they travel extensively. Suppose a researcher studying the habits of retired Italians believes that the percentage of retired Italians under the age of 80 who do extensive travelling is greater than 50%. The researcher finds that 40 out of 75 randomly sampled Italians under the age of 80 do extensive travelling. Test the researcher's belief using a significance level of 5%. 4) Test the hypothesis that more female teenagers use twitter than male teenagers. Samples of 500 female and 500 male teenagers were selected, and 430 females and 390 males used twitter in the past week. Use a 10% significance level.
What is the role of the F test in multiple regression? (b) How is the F statistic calculated from the ANOVA table? (c) Why are tables rarely needed for the F test?
a bag contains 8 red 3 white and 9 blue marbles. if 3 marbles are drawn at random without replacement calculate the
a retired couple has 2450000 in a savings account that earns 2.22 interest compounded quarterly. how much money can
What are the best-case and worst-case outcomes the owner may face on this product if she implements your suggestion?
Explain the process of factoring a trinomial with a leading coefficient that is not equal to one. Why is this process more difficult than when the leading coefficient is equal to one? Give an example. How could we apply FOIL in this context?
Based on this information, calculate the interest charged by each card for this purchase and which card is the better deal and by how much
1.several years ago some colleagues and i did an experiment to see if avons skin-so-soft was as good as off in
Lab technicians at a major mdical lab can process an average of 400 blood samples a day with a standard deviation of 50 samples. The processing follows a normal distribution.
Determine the appropriate statistical tool to test the hypothesis based on the research question - conduct a hypothesis test with a 95% confidence level, using the statistical tool.
What are the assumptions of regression analysis and how do you evaluate them?
Let p vary from 0.02 to 0.20 in increments of 0.02. b) Sketch the graph of the probabilities of the lot acceptance as the p value varies from 0.02 to 0.20.
Tthe mean change score for the sample studied is an increase of 5.2. What is considered a medium effect size for a t test for dependent means?
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