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Question: During a period of one month, a random sample of 27 approved life insurance policies is selected, and the processing time, in days, is recorded:
73 19 16 64 28 28 31 90 60 56 3156 31 56 22 18 45 48 17 17 17 9192 63 50 51 69 16 17
(a) In the past, the mean processing time was 45days.At the 0.05 level of significant, is there evidence that the mean processing time has changed from 45days?
(b) What assumption about the population distribution is needed in order to conduct the t test in (a)?
(c) Use a box plot to evaluate the assumption made in (b)?
(d) Do you think that the assumption needed in order to conduct the t test in (a) is valid? Explain.
These 64 students will spend a combined total of more tahn $715.21? What is the probability that these 64 students will spend a combined total between $703.59 and $728.45?
Using the spreadsheet for exercises 1-3, estimate how the population will change from this generation to the next under each of the following conditions.
Can you provide a clear, concise interpretation for the slope coefficient on price? Is that coefficient significantly different from zero? How do you know that?
At least half the patients are under 15 years old? First, explain how this can be modeled as a binomial distribution with 8 trials, where success is visitor age is under 15 years old and the probability of success is 20%.
1. each supplier is rated on a 10-point scale 10 highestfor four different criteria price quality delivery and
A random selection of accounting firms from three regions is taken and they are asked to state the starting salary for a new accounting graduate. Do a one-way ANOVA to analyze these data using a 1% level of significance:
where phi = golden ratio. What is the long-term fraction of time the chain spends in each of the states? Answer must be gotten without a calculator.
A new weight-watching company, Weight Reducers International, advertises that those who join will lose, on average, 10 pounds the first two weeks with a standard deviation of 2.8 pounds.
In an article entitled "Fuel Economy Calculations to Be Altered," James R. Healey indicated that the government planned to change how it calculates fuel economy for new cars and trucks.
a quarter that is tossed 60 timeswhat is the probability that it will come up heads 20 or more times? estimate the
According to TNS Intersearch, 69% of wireless web users use it primarily for receiving and sending e-mail. Suppose that three wireless web users are selected at random. What is the probability that all of them use it primarily for e-mail?
Illustrate the regression model and predict it. The following table shows the yearly maintenance costs for several cars, as well as their age.
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