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Q1)i) A study of the relationship between exercise and heart attacks is conducted among women who don't smoke. Describe whether gender is confounder.
ii) A case-control study of relationship between liver cirrhosis among both non alcoholics and alcoholics. Describe whether smoking is confounder.
iii) Interpret results of the following studies
Odds ratio of 1.2 (95% confidence interval: 0.8-1.5) is found for association of low socioeconomic status and occurrence of obesity.
Some researchers have conjectured that stem-pitting disease in peach tree seedlings might be controlled with weed and soil treatment. An experiment was conducted to compare peach tree seedling growth with soil and weeds treated with one of two her..
Given the same significance level, a ________ value of t will be required to reject the null hypothesis compared to the value of z required for rejection.
What is the probability that all tree students pick a different card?
Assuming the nurses surveyed were a simple random sample from the population of all nurses in the United States, find the appropriate null hypothesis for these data
Explain in words general pattern of correlation is statistically important.
Test the hypothesis that there is no difference in the mean scores of Exam 1 and Exam 2 against the alternative that the average is greater for the second exam.
Using the following data on 15 workers, construct an exact 95% confidence interval for µ.
The ANOVA table is given below,as well as a table of means and standard deviations for the three groups. Evaluate the t statistic for testing contrast
For the mold described in (g), can you find the probability that it's COST value will exceed $150,000? If yes, obtain this probability. If no, why not?
For following scores determine values of each expression: X: 4, 2, 1, & 5. åX, åX 2 , (åX) 2 , å(X-1).
Compute the probability that student eats at fast food restaurant 2 or more times per week?
Illustrate by computation that, for straight -line regression of Y on x, β1= 0.
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