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A market research firm employs a large number of typists for data entry. The time it takes for new typists to learn the computer system is known to have a normal distribution with a mean time of 90 minutes and standard deviation of 18 minutes.
What proportion of new typists need between 1 and 2 hours to learn the computer system? P(60 ≤ X ≤ 120 min.)
Consider binomial distribution with 14 identical trials, and probability of success of 0.4.
A presidential candidate's aide estimates that, among all college students, the proportion p who intend to vote in the upcoming election is at least 60%.
Formulate and test an appropriate set of hypotheses to determine if the machine can be qualified. Use a = 0.05. Find the P-value.
What is the probability that the sample mean breaking strength of a random sample of 100 pieces of fabric is less than 1 .8 kg/mm?
Use drinking as an excuse for outrageous behavior. including public nudity and dancing on tables. Find the standard error of this estimate. and interpret.
An insurance company states that 90% of its claims are settled within 5 weeks. A consumer group selected a random sample of 100 of the company's claims and found 75 of the claims were settled within 5 weeks.
If one runner is selected at random, what is the probability that this runner will complete this road race in less than 231.58 minutes?
A marketing survey is taken among fast food customers to determine their preference for hot dogs or pizza. Of the 200 respondents selected,
Estimate the mean mathematics ACT score for all statistics students at this college. Give the 95% confidence interval.
Costs of Television: Listed below are prices (in dollars) and quality rating scores of rear-projection televisions. All of the televisions have screen sizes of 55 or 56 inches.
Using a 5% level of significance, is there any difference in proportion of guests who would select the two resorts? What is your conclusion?
A state representative is reported as saying that about 10% of reported auto thefts involve owners whose cars have not really been stolen, but who are trying to defraud their insurance company.
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