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A random sample of 100 two-month-old babies is obtained, and the mean head circumference is found to be 40.6 cm and the standard deviation 1.6 cm. Use a 0.05 significance level to test the claim that the mean head circumference of all two-month-old babies is equal to 40 cm. Use both the p-value and the rejection point methods.
Perform a one-way ANOVA to assess whether there are significant differences in mean change in percent stenosis among the four groups.
Another simple question, can you give me 3 points regarding to origins of the Cold War.
Give a 95% confidence interval for the average sale (in dollars) per customer for the entire level over the period of the postholiday sale.
The senior vice president for marketing at Westin Hotels believes that the company's recent advertising of the Westin Plaza in New York has increased.
A research firm conducted a survey to determine the mean amount people spend at a popular coffee shop during a week. They found the amounts spent per week followed a normal distribution with a population standard deviation of $4.
Construct a 90% confidence interval for the population proportion, p, in order to test the claim from a confidence interval point of view. What is the best point estimate for p?
A local authority is under severe financial pressure and is considering selling some of the land it owns to a building company.
Goal 3 calls for the wiping out diseases like HIV/AIDS, tuberculosis, and malaria. How many people are infected with HIV/AIDS?
It is important for a woman to know if she is pregnant so that she can discontinue any activities, medications, exposure to toxins at work, smoking, or alcohol consumption that could be potentially harmful to the baby.
What are the four scales (levels) of measurement used in research? Why do researchers need four different scales?
Jane chooses every 20th person in the campus phone book to call for her interview study. Justin identifies important subgroups in the campus population
A random sample of 15 snow mobiles was selected, and the lifetime (in months) of the batteries was measured. The variance of the sample was 8.6. Find the 90% confidence interval of the true variance and standard deviation.
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