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Consider the file data on Taxes that is included in worksheet P2 on the exam template. This data represents property taxes paid by 170 residents that live in a small town. Assume this file to be the entire population. Answer the following questions :
a) A local politician in this town has stated that the average property taxes are $1800 and most people do not pay more than this amount. Conduct a test at the alpha = .01 level to determine if this is true. For this test, consider a sample size of 30 households. Also, you want to have strong evidence to disclaim his hypothesis.
b) Find the probability of a Type two error when U = 2200.
c) Conduct the same test as in part a, however, use sampling data by taking the fist 50 data points in the population
d) Conduct a test at the alpha = .05 level to determine if there is a difference between taxes paid in neighborhood 1 and in neighborhood 4. Use all the data points from both neighborhoods and consider this to be sample data.
e) From part d, what is the 95% confidence interval for the difference between means.
The board of directors of Saner Automatic Door Company consists of 12 members, 3 of whom are women.
Determine the z values for 29 and 34 hours. What percent of the garages take between 32 hours and 34 hours to erect?
If a sample of 25 workers found that the average work week is 48 hours, conduct a hypothesis test to determine if there is significant evidence that the length of the average work week has increased? Use alpha=.05
Finding an X score. All Bright University will consider an applicant for its MBA program who scores 95 percent or higher on the GMAT exam. The mean and standard deviation, respectively, for this test are 578 and 94. What is the lowest score (X) th..
The mean height of a certain plant is 160 centimeters. Suppose a botanist wants to carry out a hypothesis test to see if the mean height when these plants are treated with a certain chemical differs from 160. What is the null hypothesis and the al..
Powers Tire Company (Which specializes in tires for vehicles ca. 1965) needs your expertise to help them schedule over the next three months. They can make tires using regular labor, or subcontracting.
The odds ratio between treatments (A, B) and outcome (death, survival) equals 2.0. What do you think about the following interpretation: "The probability of death with treatment A is twice that with treatment B". If you think, the above interpreta..
In the last quarter of 2007 a group of 64 mutual funds had a mean return of 0.9% with a standard deviation of 5.2%. Consider the normal model N(0.009.052) for the returns of these mutual funds.
An experiment was performed to investigate lifetime of a component exposed to high heat. Three different oven types were used at either 550°F or 600°F.
use the following sample data to test whether the GPA are different at the 0.05 level of significance.
In this paragraph, be sure to make it clear how you handled the issue of conducting three planned comparisons. Also provide the ANOVA summary table for these results.
Critically discuss the main differences between descriptive and inferential statistics? Provide an example of either type of statistics either from a recent study you heard about or a made up study you'd be interested in learning about.
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