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Basic Statistics
Surgical Intensive Care Unit would like to be better prepared by predicting number of surgical patients they must expect.
Past 15 days illustrates following numbers of surgeries performed. Perform the 3-period moving average, exponential smoothing forecasting using the alpha of .25, and seasonal forecast with 3 seasons.
Day Surgeries1 102 83 124 105 96 147 118 109 1510 1311 1312 1613 1414 1315 18
Forecast for day 16 by using 3-period Moving Average?
Forecast for day 16 by using Exponential Smoothing (alpha = .25)?
Forecast for day 16 by using Seasonality with 3 seasons?
What two assumptions must be met when you are using the z test to test differences between two means? Can the sample standard deviations s1 and s2 be used in place of the population standard deviations σ1 and σ2?
The histograms of some sampling distributions are symmetrical. T-F What would make a histogram symmetrical, and give an example of a symmetrical distribution? A random sample of size 36 is to be selected from a population that has a mean μ = 50 an..
q1. a pistachio rancher buys a new fertilizer system that is supposed to increase the yield per acre. she uses the
a genetic test is used to determine if people have a predisposition for thrombosis which is the formation of a blood
what is the probability that a randomly selected value from the distribution will be greater than 2.1 standard deviations avoe the mean?
why is a z-score range -3 to 3? if a normal distribution is not assumed can a z-score still be used? why or why
In fitting a least squares line to n=15 data points, the following quantities were computed: SSxx=55, SSyy=198, SSxy=-88, x-bar=1.3, and y-bar=35.
1.i wish to find a 95 confidence interval for the mean number of times men change channels with a remote control during
electric charge is distributed over the rectangle 1 x 2 0 y 2 so that the charge density at x y is sx y 2xy y2
Of the 900 employees, 590 had college degrees, 120 were single, and 80 were single college graduates. Find the probability that an employee of the company is married and has a college degree.
an urn contains 4 red and 6 blue balls. suppose that 8 balls are selected at random and with replacement. what is the
What is the average time a car waits to begin the wash job? What is the average number of cars in the car wash system? What is the average time required to wash a car?
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