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Which of the following can be treated as binomial experiment?
a. Surveying 1200 registered voters to determine their preferences for the next president?
b. Surveying 1200 registered voters to determine whether or not they would again vote for the current president.
c. Tossing an unbiased coin 500 times.
d. Tossing a biased coin 500 times.
It was reported that 20 readers responded and 87% said "no" while 13% said "yes." Recognize 4 major flaws in this survey.
Find out annual break-even volume for the Rolling Creek Textile Mill.
Given are the numbers of times the machine was used over each of the last 30 days. Find out the mean number of times the machine was used per day.
To determine whether there is a difference in the proportion of viewers watching the three channels.
Sample data are reported for 50 employees of small companies, 75 employees of medium companies, and 100 employees of large companies.
Determine the probability distribution associated with these data.
Find the margin of error for the 95% confidence interval used to estimate the population proportion.
Calculate the test statistic. Determine the p-value of the test-statistic.
Assuming that the variability is unchanged (i.e., σ = 6), is there sufficient evidence to suggest that the strength of the product has increased at the 1% level of significance?
What IQ score should one have in order to be eligible for Mensa?
For a study that consists of personal interviews with participants (rather than mail or phone surveys), explain why simple random sampling might be less practical than some other sampling methods.
Perform the indicated test of hypothesis. HO: M 7, given x= 0.01, N=25, Xbar = 7.019 and SD is =.1681. Assume the sample is selected from a normally distributed population.
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