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The administrator of a nursing home would like to do a time-and-motion study of staff time spent per day performing nonemergency tasks. Prior to the introduction of some efficiency measures, the average person-hours per day spent on these tasks was µ = 16. The administrator wants to test whether the efficiency measures have reduced the value of m. How many days must be sampled to test the proposed hypothesis if she wants a test having a =.05 and the probability of a Type II error of at most .10 when the actual value of m is 12 hours or less (at least a 25% decrease from prior to the efficiency measures being implemented)? Assume σ = 7.64.
The length of a Colorado brook trout is normally distributed. What is the probability that a brook trout's length, (Round your answers to 4 decimal places.)
the length of useful life a fluorescent tube used for indoor gardening is normally distrubuted. the useful life has a
for a cluster sample the estimates of the halves came in at 58.75 and 58.35. find the standard
1. ross whites machine shop uses 2500 brackets during the course of the year and this usage is relatively constant
an io psychologist asks employees to complete surveys measuring job satisfaction and organizational citizenship
Suppose the correlation between weight and height for adults is +.80. What proportion (or percentage) of the variability in weight can be explained by the relationship with height?
Is there evidence of a difference in the variability of the waiting time between the two branches? (Use 5% level of significance). Find the p-value in (a) and interpret its meaning.
in a recent shipment of insulin syringes hospital administrators discovered eight percent were unusable due to defects.
Chocolate bars produced by a certain machine are labeled with 8 oz. The distribution of the actual weights of these chocolate bars is Normal with a mean of 8.1 oz and a standard deviation of 0.1 oz. What proportion of chocolate bars weighs less th..
Let X be a continuous random variable with mean µ = 10 and variance σ2 = 100/3. Using Chebyshev's Inequality, find an upper bound for the probabilities.
ariba ltd produces a range of ground coffee for commercial use within cafeacutes and restaurants. the company is
In an experiment on a new drug to determine the most effective dosage and method of administration, subjects were randomly assigned to either 5, 10, 15, or 20 mg of the active drug.
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