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A study is designed to investigate whether there is a difference in response to various treatments in patients with rheumatoid arthritis. The outcome is patient's self-reported effect of treatment. The data are shown below. Are symptoms independent of treatment? Conduct a ChiSquare test at a 5% level of significance.
Treatment 1: Symptoms Worsened= 22 No Effect=14 Symptoms Improved=14 Total=50
Treatment 2: Symptoms Worsened=14 No Effect= 15 Symptoms Improved= 21 Total=50
Treatment 3: Symptoms Worsened= 9 No Effect=12 Symptoms Improved= 29 Total=50
There're several measures of central tendency. By far the most frequently utilized of these measures is mean of population. Remember that the source of the data that you want to analyze always comes from what is called a population.
A survey is being planned to estimate the prevalence of secondary infertility amongst couples aged 20-45. The investigators expect the prevalence to be 10%, and would like to estimate it to within 5% of the true value (with 90% confidence). How many ..
1. define the random variable x to be the time you get home on thursday. a is x a discrete or continuous random
Time spent using e-mail per session is normally distributed, with μ = 8 minutes, and σ = 2 minutes. If you select a random sample of 25 sessions,
Mean of 2.25 ounces and a standard deviation of 0.15 ounce. 77% of the apples will contain at least how many ounces of juice?
If sample mean is M=44. Is this sufficient to demonstrate significant effect? Again assume a Two-tailed test with a=0.05.
Create a survey questionnaire that will help you gather data relevant to the problem that interests you. the survey questionnaire must be presented to the lecturer for comments and approval before administering to the target repondents. (minimum 10 q..
You're the production manager for operation that produces circuit boards. Each board is tested at the end of manufacturing process. Rejected boards are discarded and have no future value.
Overtime happens after eight hours of work on given day. Determine the probability that letter carrier works overtime on any given day?
Rodney partida is an American who is of Mexican ancestry. He was convicted of burglary with intent to commit rape. Use the "rule of thumb" to find the minimum usual number and the maximum usual number of Mexican-americans.
Your company ships a lot of packages needing quick delivery and short notice. In the past, you have used Speedy Air Delivery Service, but you are beginning to receive complaints from customers who say they are not receiving their packages on time.
The standard deviation was $21,330. At the .01 significance level, can we conclude that there is more variation in the selling prices of the oceanfront homes?
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