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Suppose that you have the following data
x 3 5 2 6 1 4
y 25 110 9 250 3 71
a) Draw the scatter diagram. Does it appear that x and y are related? If so, how?
b) Test to determine whether there is evidence of a linear relationship
Identify and justify which type of sampling (random, stratified, systematic, cluster, convenience) is used in the following examples.
What can be done to remedy multicollinearity? Use ANOVA instead of Regression.
Under what circumatances do you use a one-sided confidence interval instead of a 2 sided confidence interval?
P-value to test hypotheses,
A least squares linear trend line is just a simple regression line with the independent variable being time (months or years for example).
When modelling E(y) with single qualitative independent variable, number of 0 - 1 dummy variables in model is equal to number of levels of qualitative variable.
Suppose the population standard deviation is unknown. If 71% of all sample means are greater than 49 hours and the population mean is still 50.4 hours, what is the value of the population standard deviation?
The State of Ohio plays a daily (except Sunday) three digit lottery, where the player chooses any three numbers, 1 thru 10, three different times.
The exercise problem the following information to figure prevalence and incidence rate:
When performing a 2-way ANOVA with replication you must first: A) Perform an interaction hypothesis test B) Take out the error because you ran replicates and error makes no sense with replicates
Chicken Delight claims that 84 percent of its orders are delivered within 10 minutes of the time the order is placed. A sample of 70 orders revealed that 55 were delivered within the promised time.
A random sample of 100 computers showed a mean of 115 gigabytes used with a standard deviation of 20 gigabytes. What is the standard error of the mean?
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