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1. What if the size for each sample were increased to 20? Would a sample mean of 115 or more be considered unusual? Why or why not?
2. Why is the Central Limit Theorem used?
3. Consider situations in your work or home that could be addressed through a continuous probability distribution. Describe the situation and the variables and determine whether the variables are normally distributed or not. How could you change these to a normally distributed dataset?
The politician's advisors estimated the proportion supporting her fiscal policy to be .60. How large of a sample is required?
Which of the following statements is true regarding a nonparametric test? We assume that the data has been chosen from a normally distributed population
Assume that the class has 60 students and that the examination period is 90 minutes in length. How many students do you expect will be unable to complete the exam in the allotted time.
Stock A has an expected return of 12% and a standard deviation of 40%. Stock B has an expected return of 18% and a standard deviation of 60%. The correlation coefficient between Stocks A and B is 0.2.
A metropolitan school system consists of three school districts-norths, south, central. The north district contains 25% of all students, the south district contains 40%, and the central district contains 35%.
How would you find the normal approximation to the binomial probability P(x = 5) in part A? Please show how you would calculate µ and σ in the formula for the normal approximation to the binomial, and show the final formula you would use without g..
According to the Scranton Edison Company, utility-plant investment per employee was approximately $453,300; $492,400; $498,900; $531,900; $553,900;
Find a dataset: approximately 30-100 scores or observations. Write a null and alternative hypothesis, conduct a statistical significance test (in SPSS or Excel), and tell what decision you'd make about the null hypothesis, and why.
Let x be a random variable that represents a test score. What is the lowest score that would still place a student in the top 40% of the scores?
A survey is being planned to determine the mean amount of time corporation executives watch television. A pilot survey indicated that the mean time per week is 20 hours, with a standard deviation of 5.5 hours
Calculate chi-square for the cross-tab. Show your work. Is there a statistically significant relationship between these variables?
Conceptually we would expect the probability of newborn males and females to be the same. However, census reports indicate that the ratios of males and females in various countries do not conform to the theoretical prediction.
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