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A county has four major hospitals: 1) Regional Memorial; 2) General; 3) Charity; and 4) City. A multiple regression model is used to compare the time spent in the hospital after a heart by-pass surgery among the four hospitals. The response (dependent) variable is the amount of time spent in the hospital (in days). The variables used to predict the time spent in the hospital include the patient's age, cholesterol level (in mlg.), blood pressure, as well as variables indicating the hospital in which the surgery was performed. Determine the total number of independent variables in the multiple regression model. Indicate how many of these are quantitative variables and how many are indicator (dummy) variables
Using the p- value approach, test the hypotheses at the 5% level of significance.
If 36 women are selected at random, find the mean, and standard deviation, of the population of sample means. Suppose that the sampling is done without replacement and use a finite population correction factor.
In this research report you will be analysing a set of data of which can be found in an EXCEL file available for download in the Assessment section of the Blackboard site.
A researcher used stepwise regression to create regression models to predict Birth-Rate (births per1000) using five predictors:
What fraction of the calls last between 4.2 and 5 minutes?
Express Courier Service has found that the delivery time for packages is normally distributed, with mean 13 hours and standard deviation 2 hours.
Summarize the relationship between sample size and confidence level.
1) There are 500 employees in a firm, 45% are female. A sample of 60 employees is selected randomly. a) Determine the standard error of the proportion.
A random sample of 50 households revealed a mean of $112,000 and a standard deviation of $40,000. What is the standard error of the mean?
Prepare a scatter plot and Interpret the meaning of slope, b1, in this problem
Use normal approximation to determine probability that x = 2. Illustrate all work.
Find out the test statistic s and its two-sided P -value. Do data give good evidence that population mean is not zero?
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