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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. Is there enough evidence to support the consumer group's claim that fewer than 90% of the claims were settled within 5 weeks? Test using the traditional approach with a = 0.05.
Polls showed the two main candidates in the 2004 presidential election were nearly tied on the day before the election. To predict the winner a newspaper would like to have a poll that has margin of error less than 1%. Roughly how large a sample w..
We are asked to test for independence between age (i.e., adult and teen) and drink preferences.
Engineers want to design seats in commercial aircraft so that they are wide enough to fit 98% of all males. (Accommodating 100% of males would require very wide seats that would be too expensive.)
Compute the mean and variance of the following discrete probability distribution.
Obtain a test statistic and p-value assuming equal variances. Interpret these results.
Their resting heart rates were measured. A partial ANOVA table is given.
What assumption about the population distribution is needed in order to conduct the t test in (a)?
Three companies are attempting to sell you a pollution reduction additive to your chemical waste. Given limited resources, which prevents you from developing the additive yourself, you get each company to give you a sample to the product.
At the .05 significance level, can we conclude that the mean waiting time is less than 3 minutes?
one class of 40 students complain that they were harshly graded in the examination as l0 students received A or B ; 17 received a C ; and the rest received a D or lower. QUESTION: Is the class's complain about harsher grading justified? ( use a : 0..
This test result prompts a state administrator to declare that the mean score for the sate's eighth graders on the examination is more than 275. at a=.04, is there enough evidence to support the claim.
Suppose the population is normally distributed they make a decision to do a hypothesis test.
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