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In a study, the use of gloves among nurses was observed. Two populations of nurses were studied, those who were in the field 5 years or less, and those who were nurses for more than 10 years. Of those with 5 years or less experience, 98 observations were made, 89 of those 98 wore gloves. For the ones with 10 years or more, 61 observations were made, in 35 of those cases nurses wore gloves. At a significance level of 0,01, test the hypothesis that there is no difference in the proportion of nurses who wear gloves between the two populations.
q1. two different methods were used to determine the yield of a chemical. the experiment was run using eight different
if there is a strong negative linear relationship between the variables the value pf r will be close to what
seventy percent of the bicycles sold by a certain store are mountain bikes. among 100 randomly selected bike purchases
What percentage of population scored between the mean and Jorge?
Determine whether families with income of $40,000 will have to spend less than $6,500 to send their children to prestigious colleges. (Use α = 0.05.)
the bureau of labor statistics american time use survey showed that the amount of time spent using a computer for
question the percentage of students in private school is about 11.in a sample of 450 students from different countries
Find the probability that a randomly selected trading value exceeds 4.1 million and find the trading volume greater than 90% of all trading volumes. Use formula X1 = Z σ + µ
By measuring the amount of time it takes a component of a product to move from one workstation to the next, an engineer has estimated that the standard deviation is 3.22 seconds.
An investigator wants to design a study to estimate the difference in the proportions of men and women who develop early onset cardiovascular disease
a computer memory manufacturer specifies that its memory chip stores data incorrectly an average of 6.3 out of 10
The FDA claims that the mean nicotine content exceeds 30.2 milligrams for this brand of cigarette and their stated reliability is 99%. Do you agree?
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