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You notice in your introductory psychology class that more women tend to sit up front, and more men in the back. To determine wheather this difference is significant, you collect data on the seating preferences for the students in your class. The data follows.
Men Women
Front of the room 15 27
Back of the room 32 19
What is X2obt?
What is Df for this test?
What is X2cv?
What conclusion could be drawn from these results?
A sample of 49 pieces of cloth reveals a sample mean breaking strength of 69.1 pounds. State the null and alternative hypotheses.
The following data were obtained from an independent measures research study comparing three treatment conditions. Use an ANOVA with alpha=.05 to determine whether there are any significant mean differences among the treatments.
a) Under what circumstances can z be greater than one? b) Under what circumstances can a probability be greater than one?
Describe the effect of an outlier or extreme value on the confidence interval - Find the probability that the return for common stocks
A national water expert is interested in determining the average amount of lead (in ppm, parts per million) that is found in the Houston, Texas drinking water. To conduct her research, she considers only those residential households within the city l..
About 95% are between 500 +- 200; i.e. between 300 and 700 Where is the data located? Where is the "middle" of the data? How variable are the data? How spread out about the "middle" are the data?
Based on this sample information, develop a 90 percent confidence interval for the population mean yearly premium. How large a sample is needed to find the population mean within $250 at 99 percent confidence?
Using the telephone numbers listed in your local directory as your population, randomly obtain 20 samples of size 3. From each telephone number identified as a source, take the fourth, fifth, and sixth digits.
A random sample of 46 observations was selected from a normally distributed population. The sample mean was xbar=81, and the sample variance was s2=35.0. Does the sample show sufficient reason to conclude that the population standard deviation is not..
Make a worksheet in Excel for your calculations. (b) Make a histogram of the data. Would you be justified in using a parametric t test that assumes normality? Explain.
At the .01 significance level, is there a relationship between job pressure and age?
X has a normal distribution with a mean of 80.0 and a standard deviation of 3.5. Find the following probabilities.
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