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It is known from past information that the average house in America has 2.5 bedrooms. Suppose I take a sample of 28 houses now and find that the average number of bedrooms the homes have is 2.85 with a sample standard deviation of .83. I'm interested in seeing if there is evidence that the average number of bedrooms has increased.
a. Using my sample of 28 houses, what would be the 95% confidence interval for the population mean?
b. What are the null and alternative hypotheses?
c. Calculate the test statistic.
d. Find the p-value.
Joe wants to sell his car. He receives one offer each month and must decide immediately whether to accept the offer. Once rejected, the offer is lost. The possible offers are $600, $800, and $1,000, made with probabilities 5/8, ¼ and 1/8 respectiv..
A toothpaste was formulated with a silica content of 3% by weight. The manufacturer randomly samples 33 tubes of toothpaste and finds their mean silica content is 3.4% and the standard deviation is 0.43%. Test the hypothesis that the mean silica c..
a local health center noted that in a sample of 400 patients 80 were referred to them by the local hospital.a. provide
Write the hypothesis in words, being careful to specify the populations and the parameter of interest, by completing this sentence.
For each of the given areas, define appropriate quality characteristic(s) and parameters and indicate the hypotheses that you would test:
Discuss the utilization of statistics in the study of crime and criminal behavior?
1. Why is it important to think carefully about decision situations that involve multiple conflicting objectives? 2. Explain the general decision-analysis approach to dealing with multiple objectives.
indicate whether the data are a time series or a cross section.number of cars sold in a dealership each day in
Construct a 97% confidence interval for the difference between the proportions of all orders placed at the two warehouses that are mailed within 72 hours.
How would you allocate a sample of 900 observations if you want to estimate the mean electricity consumption for all households in the city?
An online shoe retailer sells men's shoes in sizes 8 to 13. In the past orders for the different shoe sizes have followed the distribution given in the table.
Education reform is one of the most hotly debated subjects on both state and national policy makers' list of socioeconomic topics.
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