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Why is it important to know the standard deviation for a given sample? What do researchers learn about a normal distribution from knowledge of the standard deviation? A sample of n=20 has a mean of M = 40. If the standard deviation is s=5, would a score of X= 55 be considered an extreme value? Why or why not?
Can you please define and thoroughly explain the terms null hypothesis and alternative hypothesis. Can you expalin how are they used in hypothesis testing?
What is meant by the term standard error. Why is the standard error important in research using sample distributions?
Consider the following scenario: A random sample obtained from a population has a mean of µ=100 and a standard deviation of σ = 20. The error between the sample mean and the population mean for a sample of n = 16 is 5 points and the error between a sample men and population mean for a sample of n = 100 is 2 points. Explain the difference in the standard error for the two samples.
Please provide at least 2-3 scholarly research sources. May I suggest, Statistics for the Behavioral Sciences (9th) ed., by Gravetter & Wallnau (2010)?
Construct the 95% confidence interval for the proportion of students with at least one injury.
Differentiate between a point estimate and an interval estimate for a population parameter. What is necessary for an interval estimate to be a confidence interval?
Woodco manufactures tables and chairs. Each table and chair must be made entirely out of oak or entirely out of pine. A total of 150 board feet of oak and 210 board feet of pine are available.
Create a scatter plot for the data. Determine the correlation coefficient for the data.
In a random sample of 225 students at a university, 180 stated that they were nonsmokers. Based on this sample, compute a 95% confidence interval for the proportion of all students at the university who are nonsmokers.
The following table lists the annual amounts of glass cullet produced by Kimble Glass Works, Inc. Determine the least squares trend equation. Estimate the amount of scrap for the year 2005
In a sample of 855 bartenders, 48% heard complaints from persons about work. If the margin of error was 4.4%, what was the confidence level that was used?
At the .10 significance level, can we conclude that there is a difference in the amounts quoted?
What is the probability that the number of granite selected for analysis is within 1 standard deviation of it means value.
State the alternative hypothesis in statistical terms. Define the critical region by drawing the distribution and labeling the z-critical value.
If 36 women are selected at random, find the mean, and standard deviation, of the population of sample means. Suppose that the sampling is done without replacement and use a finite population correction factor.
When the purpose of sampling is to detect when a process becomes too variable the chart of choice will be a c-chart?
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