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Study Resources (Statistics)

A consumer affairs investigator records the repair cost for 4 randomly selected TVs. A sample mean of $87.52 and standard deviation of $19.29 are subsequently computed. Determine the 80% confidence interval for the mean repair cost for the TVs. Assume the population is approximately normal. Step 2 of 2: Construct.
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A congressional comitteis studying hospital costs of daily patient care, The figure is needed in a hurry andthe effort to determine daily costs at each hospital is considered. Thus the comittee decides to take a randomsample of 100 hospitaals in the country and to make a 90% confidence interval estimate.
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A confidence interval was used to estimate the proportion of statistics students who are female. A random sample of 72 statistics students generated the following confidence interval (.438,.642). Using the information above, what sample size would be necessary if we wanted to estimate the true proportion to within 3% using.
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A computer password consists of eight characters, How many different passwords are possible if each character may be any lowercase letter or digit? How many different passwords are possible if all characters are lower case letters? What is the probability of generating a password with all lowercase letters, if a.
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A construction company in Naples, Florida, is struggling to sell condominiums. In order to attract buyers, the company has made numerous price reductions and better financing offers. Although condominiums were once listed for $300,000, the company believes that it will be able to get an average sale price of $210,000..
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A consulting group recently conducted a global survey of product teams with the goal of better understanding the dynamics of product team performance and uncovering the practices that make these teams successful. One of the survey findings was that 32% of organizations have a coherent business strategy that they stick.
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A consumer interest group wishes lo research the amount of time UA students spend participating in extracurricular activities. There were 500 college students selected from UA to participate in the study. From the previous semester, students recorded the number of hours per week they spent doing extra activities. Based on.
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A consumer organization that evaluates new automobiles customarily reports the number of major defects in each car examined. Let X denote the number of major defects number of major defects in a randomly selected car of certain type. The cdf of X is as follows: Calculate the following probabilities directly.
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A computer system, uses passwords that contain exactly eight characters, and each character is one of 26 lower-case letters (a-z) or 26 upper-case letters (A-Z) or 10 integers (0-9). Let S2 denote the set of all possible passwords, and let A and B denote the events that consist of passwords.
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A concrete mix is being designed to provide adequate compressive strength for concrete blocks. The specification for a particular application calls for the blocks to have a mean strength greater than 1350 KPa. A sample of 20 blocks is produced and tested. Their mean compressive strength is 1356 KPa, with.
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