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Compute the standard error of the mean O(funny o with line) line over x, for sample sizes of 50, 100, 15o, and 200. What can you say about the size of the standard error of the mean as the sample size is increased?
Now he wants to know if there is a difference between the three formats. Is there?
If 3 different factor levels show a lot of variation between levels this implies:
For each year, create a bar chart and a pie chart.
The probability distribution of a random variable X is shown below, where X represents the amount of money (in $1,000s) gained or lost in a particular game of Blackjack.
Now suppose that a finished product is randomly selected. What is the probability that it is defective?
The following data show the cost of electricity during August 2010 for a random sample of 50 one-bedroom apartments in a large city:
At the .01 significance level, is there a difference in the use of the four entrances?
Can researcher conclude that humidity has significant effect on eating behaviour? Use two-tailed test with a = 0.05.
The researcher was interested in how well what he/she manipulated predicts how happy subjects feel at the end of the procedure. Using the data below, calculate the regression constants and present the equation for the regression line.
A certain airplane has two independent alternators to provide electrical power. The probability that a given alternator will fail on a 1-hour flight is .02. What is the probability that:
Create a scatterlpot of P_RFM and P_HELM. If drawing plot by hand, use graph paper to make sure accuracy. Be sure you label axes. After you have created the scatterplot, consider its form and direction. Recognize outliers, if any.
To determine whether two categorical variables are independent, one should use the:
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