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Technology and the Internet
Technology is constantly improving, increasing the speed of communication, and many software programs on tablets, laptops, and phones now anticipate our next words or phrases. Docmail, a UK-based printing and mailing company, conducted a study and concluded that one of every three adults had not been required to produce something in handwriting for more than a year.
To check this claim in the United States, a random sample of 656 adults was obtained, and 235 said they had not been required to produce something in handwriting for more than a year. Is there any evidence to suggest that the proportion of Americans not using handwriting is different in the United States? Use a = 0.05 and find the p value associated with this test.
Use this information to find the upper and lower limits of the first class if you wish to construct a frequency distribution with 10 classes.
The number of items rejected daily by the manufacturer because of defects for last 30 days are:
For the following cases, determine whether the sampling is dependent or independent. Explain your conclusion.
Computer science instructor, 3 statistics instructors, and 4 science instructors. If an instructor is selected, find the probability of getting a science instructor or math instructor.
The Bunte Auto Repair Shop received a shipment of four carburetors. One is known to be defective. If two are selected at random and tested.
Identify the experimental unit for the study.- Identify the variable measured for each experimental unit.- Is the data collected quantitative or qualitative?
Given that z is a standard normal random variable, compute the following probabilities.
The marginal social benefit of college enrollments currently exceeds its marginal social cost. Use a graph to demonstrate the gain in efficiency that would result from an increase in college enrollment.
The accompanying data is a subset of the data reported in the article "Synovial Fluid pH, Lactate, Oxygen and Carbon Dioxide Partial Pressure in Various Joint Diseases" (Arthritis and Rheumatism, 1971: 476-477).
Of the 1,4000 homemakers sampled, 420 were able to identify the brand by name. Compute the standard error of the proportion.
The structure of a two-factor study can be presented as a matrix with levels of one factor determining the rows and the levels of the second factor determining the columns. With this structure in mind, describe the mean differences that are evaluated..
find the following percentiles for the standard normal distribution. interpolate where appropriate. round your answers
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