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The National Association of Realtors estimates that 23% of all homes purchased in 2004 were considered investment properties. If a sample of 800 homes sold in 2004 is obtained what is the probability that between 175 and 200 homes are going to be used as investment property?
In random samples of 12 from each of two normal populations, we found the following statistics: Describe what happens when the sample standard deviations get larger.
Explain the difference between one-factor and two-factor ANOVA. (b) Write the linear model form of one-factor ANOVA. (c) State the hypotheses for a one-factor ANOVA in two different ways.
Cheating Gas Pumps When testing gas pumps in Michigan for accuracy, fuel-quality enforcement specialists tested pumps and found that 1299 were not accurate (within 3.3 oz when 5 gal is pumped), and 5686 were accurate.
Below are the sample times in minutes. At the .05 significance level, can we conclude that there is a difference in their mean times?
Sketch curves representing the distribution of the original population and the sampling distribution of x for a sample of size n+16.
Determine a 95% confidence interval for true mean cost to repair this type of car.
Inspect table produced in question 2 above. Comment on relative sensitivity of minimum sample size to actual proportion and to desired half width.
Find out 90% confidence interval for the population average µ of the percentage of hospitals providing at least some charity care.
Airline were reunited with the missing items by the next day. Does this cast doubt on the airline's claim? Use a calculator to find z-scores and P-values. Reject the null if P-value
Explain the difference between the null and alternative hypothesis. Which one can be proven in a statistical sense?
Assume that the measurements came from a normal distribution. The variability of the manufacturing process is unknown means the same as the standard deviation is unknown.
Find the 95% confidence interval of the mean number of ER patients treated each day at the hospital.
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