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An Internet provider is trying to gain advertising deals and claims that the mean time a customer spends on line per day is about 28 minutes. You are asked to test his claim. How would you write the null hypothesis if:
a) you represent the internet provider and want to support the claim?b)you represent an advertiser and want to reject the claim?
In these questions we have to make a decision about the given claim. For example, if the claim is that a coin favors heads and sample results consists of 11 heads in 20 flips, conclude that there is not sufficient enough evidence to support the cl..
ABC Corporation of California publishes a variety of statistics, including the number of individuals who got a new job during the past 12 months and the mean length of time the individuals have been on the job.
The following data represent the service charge for direct-deposit customers if a customer's account falls below the minimum required $1,500 balance for a sample of 26 banks.
Compute a 90% confidence interval of the mean for a Weschler intellegence test with mean of 100.00 and standard deviation of 15.00 for a sample of 100 people. Use two decimal places.
Calculate and interpret standard error of estimate se and coefficient of determination R2 for these data.
Suppose a candidate running for sheriff claims that she will reduce the average speed of emergency response to less than 30 minutes.
We are interested in determining whether or not the opinions of the individuals (as to Yes, No, and No Opinion) are uniformly distributed.
Obtain a test statistic and p -value. Interpret the results at α = .01.
Find the marginal PMF pY (y). Hint: One possibility is to start with the answer to part (c), but the algebra can be messy. But if you think intuitively about the procedure that generates Y , you may be able to guess the answer.
What is the probability that a sample mean will be within plus-or-minus two of the population mean for each of the following sample sizes?
The National Turkey Association wants to experiment with three different feed mixtures for very young turkeys. Since no experience exists regarding the three mixtures, no assumptions can be made about the distribution of weights.
The results of a recent study regarding smoking and three types of illness are shown below. The illnesses are Emphysema, Heart Problem, and Cancer.
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