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1. Based on the sample results in Exercise 10.109, construct and interpret the 95% confidence interval for the population proportion. Is the hypothesized propor- tion (0.25) within the interval? Given the presence or absence of the 0.25 value within the interval, is this con- sistent with the findings of the hypothesis test conducted in Exercise 10.109?
2. In making aluminum castings into alterna- tor housings, an average of 3.5 ounces per casting must be trimmed off and recycled as a raw material.
A new manufacturing procedure has been proposed to reduce the amount of aluminum that must be recycled in this way. For a sample of 35 castings made with the new process, data file XR10111 lists the weights of aluminum trimmed and recycled. Based on the sample data, and using the 0.01 level, has the new procedure significantly reduced the average amount of alumi- num trimmed and recycled? Identify and interpret the p-value for the test.
For a new HDTV the mean number of months until repairs are needed is 36.84 with a standard deviation of 3.34 months.
Of 900 consumers surveyed, 414 said they were very enthusiastic about a new home decor scheme. What is the 99% confidence interval for the population proportion?
a consulting firm has to make a decision concerning bidding on a major project that has a projected profit for the firm
As part of a study of corporate employees, the Director of Human Resources for PNC, Inc. wants to compare the distance traveled to work by employees at their office in downtown Cincinnati with the distance for those in downtown Pittsburgh.
Would the mean, median, or mode of the prices of recent home sales be the best measure of central tendency and why?
Create the 95% confidence interval for portion of respondents who feel president is doing a good job. Based on the intervalin part(a), It is sensible to conclude that majority.
assume that google is hiring employees on the different business days of the week monday through friday with equal
Standard deviation of 5. suppose 100 golfers played the course today. Find the probability that the average score of the 100 golfers exceeded 74.
How many classes would you suggest? What is the most suitable class interval? What is the lower limit of the initial class? Create the frequency distribution. Describe the profile of the distribution.
last year a soft drink manufacturer had 21 of the market. in an effor to increase their portion of the market the
question in a start of the twenty-first century saw many corporate scandals and many individuals lost faith in
according to nielsen media research the average number of hours of tv viewing per household per week in the united
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