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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 are the values of the mean and the standard deviation for the standard normal model?a. the standard normal model
in keno there are 80 balls numbered from 1 to 80 and 20 are chosen at random. if you play a double number you win if
A jar containing 100,000 marbles. There are 6 colors of marbles in the jar and they are present at frequencies of 2%, 2%, 4%, 10%, 57%, 25%.
The summation sign is usually represented by:
Assume you were in charge of advertising for an automotive dealership when the gas prices increased to $6 per gallon. Most of your cars are fuel-efficient, but you have two models that have extremely poor fuel economy
The standard deviaiton is 2 pounds. If 15% of the suitcases are overweight, find the maximum weight allowed by the airline. Assume the variable is normally distributed.
Explain how the Central Limit Theorem can help you convince your boss that while you can't get rid of sampling error the results from your statistical work (that is based on sampling) can still be useful.
Then you travel the same distance to another point C moving at a constant speed of 120 km/h. Your average speed for the entire trip from A to C is?
the most common therapy for warts is cryotherapy in which liquid nitrogen is applied to the area of the wart every few
Find at least what % of the weights are within xbar ± 3.5s - pounds of a sample of high school football players.
here are the golf scores again of 12 members of a college womens golf team in two rounds of tournament play. a golf
If μ represents the mean increase in the verbal SAT score if all high school students used the method, the alternative hypothesis the teacher wishes to test is what?
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