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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.
A teacher gave a 25 question multiple choice test. After scoring the tests, she computed a mean and standard deviation of the scores. The standard deviation was 0. Based on this information
A company uses the formula C(x) = 0.02x^2 - 3.4x + 150 to model the unit cost in dollars for producing x stabilizer bars. For what number of bars is the unit cost at its minimum?
Normally distributed about a mean value of 580 with a standard deviation of 60. Determine what percentage of the students scored higher than 750 on the exam.
It does not matter, when data are skewed mean and median are the same.
Also find information about blood donations and the percentage of each type donated. How do the charts compare? Why is the collection of type O blood so important?
At the 5% significance level, can the researcher reject the hypothesis that the mean reading scores of all children in the three school systems is the same? Formulate and test the appropriate hypotheses. Use the critical value approach.
In the class, there are 17 females (of whom 8 are freshmen) and 16 males (of whom 7 are freshmen). If one student is selected at random, what is the probability of selecting a freshmen or a female?
1-state whetherbeach othe following true or false and explain whya a high negative correlation value for example p-.95
What does a confidence interval tell us and why is it importance to use a confidence interval?
A 56-question multiple choice test has 4 possible answers for each question and a student chooses the answers to each problem at random. A student selects 16 correct answers.
Determine whether the Zero Population Growth data for urban U.S. resident is also true for rural U.S. residents on the basis of the sample data with α=0.05.
The Department of Motor Vehicles (DMV) can service customers at a rate of 20 per hour (or 1/3 per minute) when it comes to license renewals. The service time follows an exponential distribution. What is the probability that it will take between..
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