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In a research project intended to gather data on the effects of type of study method on examination performance, participants are randomly assigned to one of two conditions. In one condition they study alone, using notes they took during class lectures. In a second condition participants study in interactive groups with notes from class lectures. The amount of time spent studying is held constant. All students then take the same exam. In this study:
a. What is the independent variable?
b. What is the dependent variable?
c. Identify the control and experimental groups.
d. Is the independent variable manipulated, or is it a participant variable?
In a nationwide survey of n = 1,030 adults, 6% answered yes to the question "During the last year did anyone break into or somehow illegally get into your home or apartment?"
A statistics instructor wants to know which route will get her to school the fastest. Each day from October 2 to November 15, when she gets to the turn point she checks the odometer on her car
students in an introductory statistics class were asked to report the age of their mothers when they were born. summary
From Data Set VI in Appendix B, select a sample of 20 values and find the 90% confidence interval or the mean of the number of acres. Find the mean of all values, and determine if the confidence interval contains the mean.
Is it true that one of the important properties of time series models is that some sort of pattern in the data over time should be detected first and then used within the model?
Formulate the null and alternative hypotheses. Determine the criterion for rejection or non-rejection of the null hypothesis.
scores on an english test are normally distributed with a mean of 32.3 and a standard deviation of 7.3. find the 40th
The Texas Transportation Institute at Texas A&M University conducted a survey to determine the # of hours per year drivers waste sitting in traffic.
Perform the 5 steps of hypothesis testing procedure. Please present the calculations and results and Graphs. Make all possible observations and interpret the results
Determine the mean and variance and determine the percentage of data values that fall in each of the following intervals:
1. laboratory experiment shows that the life of the average butterfly is normally distributed with a mean of 18.8 days
Find the margin of error in estimating the population mean: confidence level = 94%; sample size=86; sample mean = 113.5; and standard deviation = 12.7.
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