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Is there an association between the use of computerized system and hospital mortality? In a large-scale hospital study, the study investigator randomly sampled 35 hospitals from all hospitals in Texas. Within each of the sampled hospitals, 500 patients who were hospitalized during the past year were randomly chosen. Their medical records were retrieved and whether they died while hospitalized was noted. It was found that on average, hospitals (26 of them) in which health care information is gathered and stored on computers had a lower patient death rate than hospitals (9 of them) that still rely on the ‘paper' system (using paper forms and handwritten notes).
Political polls typically sample randomly from the U.S population to investigate the percentage of voters who favor some candidate or issue. The number of people polled is usually on the order of 1000.
Take a deck of cards. A deeck has 52 cards with two major colors(Red and Black), with 26 cards each. Red colors comes in two shapes(heart and diamond)
Must the company replace old truck? If so which of new trunks must they use? Describe in detail.
a new grug had a potency advertised at 75. given the following smaple datan25x bar 76.6s1a check manufacturers claim
Lotto, a lottery game conducted by the Ohio State Lottery Commission, consisted of selecting six numbers from the 42 numbers 1, 2, ...,41, 42.
What is the standard error of the difference between the means?
As part of this trial, they wish to determine whether there is a difference between the effectiveness for women and for men. At = .05, what is the test value?
examine the histogram of the standardized residuals for the regression of annual earning on annual hours worked among
Describe the sampling distribution of the sample proportion
He would like to determine whether there are more units produced on the afternoon shift than on the day shift.
three cards are drawn in succession from a decak without replacement. find the probability distribution for the number
The simple coefficient of determination is the proportion of total variation explained by the regression line.
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