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Correlation between the two variables based on scatter plot.
A store manager wishes to find out whether there is a relationship between the age of her employees and the number of sick days they take each year. The data for the sample are shown below.
Age ( X)
18
26
39
48
53
58
Sick Days(Y)
16
12
9
5
6
2
Draw the scatter plot for the variables.
Determine a 95% confidence interval for true mean cost to repair this type of car.
Explain the independent variable, covariate, and levels (groups) of eah. Also, explain the dependent variable and its associated measurement scale and expected outcome.
For the samples summarized below, test the hypothesis at ∞ =.05 that the two variances are equal. Variance Number of data values Sample 1 19 8 Sample 2 9 18
Evaluate the performance of this decision.
The manufacturer of a coffee dispensing machine claims the ounces per cup is normally distributed with population mean equal to 8 ounces and standard deviation equal to 0.9 ounces. If 50 cups of coffee were measured, what is the possibility that- ..
Suppose the least squares regression equation is Y' = 1,202 + 1,133X. When X = 3, what does Y' equal?
The New York Times reported (L.J> Flynn, Tax Surfing, The New York Times, March 25, 2002, p. C10) that the mean time to download the home page for the internal Revenue Service (IRS) , was 0.8 second. Suppose that the download time was normally di..
At the .05 significance level, is the number of units produced on the afternoon shift larger?
What is the equation for least squares line? Calculate the coefficient of determination.
To find the 95 percent confidence interval for the true population mean. From the results below, is it true that 95% of the sample means will fall
Determine for each variable if it is the explanatory variable, the response variable, or whether it could be both.
Is global F ratio significant? Identify this F ratio, and describe whether it is important.Is coefficient for X1 (productivity) significant? How do you know? Mention its t value and accompanying P-value.
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