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You decide to conduct a survey of a sample of 25 members of this year's graduating class and find that the average GPA is 3.2. The standard deviation of the sample is 0.4. Over the last ten years, the average GPA has been 3.0. Is this year's class significantly different from the long-run average? At what alpha level would it be significant?
At the .01 significance level, can we conclude that there is more variation in the selling prices of the oceanfront homes?
What different types of variables are used in quantitative studies? Describe each type of variable and how they differ.
A number of years ago, there was a popular television game show called Let's Make a Deal. The host Monty Hall, would randomly select contestants from the audience and, as the title suggests
Verify value of t for the independent Variable, using formula. (That is, using formula in the Formula Sheet compute the t statistic , given data provided in the print out).
Alcohol appears to be involved in a variety of birth defects, including low birth weight and retarded growth. A researcher would like to investigate the effect of prenatal alcohol on birth weight.
Sketch the distribution of sample means for sample of n = 25 scores from this population.
Below you are given a partial computer output based on a sample of 16 observations.
Serum ferritin is used in diagnosing iron deficiency. In a study conducted recently researchers discovered that in a sample of 28 elderly men the sample standard deviation of serum ferritin was 52.6 mg/L. For 26 younger men the sample standard dev..
If circuit switching is utilized, how many user can this access link support?
According to the National Football League, the average salary for players for the 2010 season was about $1.9 million while the median salary is around $770,000. Why are both numbers reported? What might the difference between the two statistics me..
Test whether there is significant difference in the test anxiety level of the three groups using nonparametric test.
What happens to the probability of getting exactly 50% heads?
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