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In a survey to estimate prevalence of obesity, order the following samples in the expected order of the width of the confidence interval for the estimate prevalence, from smallest to widest, assumin
We examine the relationship between educational degree and church attendance. We selected a sample of 30 respondents from the International Social Science Program, noting their educational status (
We examine the relationship between educational degree and church attendance. We selected a sample of 30 respondents from the International Social Science Program, noting their educational status
160 studies are done investigating the relationship between the number of hours per week spent on facebook and specific mental health issues. Assuming a significance level of p=0.05 and that the nul
A cluster sample involves selecting: A cluster sample involves selecting:
After a campaign to encourage students to take precautions against skin cancer, in a certain high school class consisting of 35 girls and 55 boys, it is observed that 24 girls and 26 boys take preca
Suppose that f(x) = e-x for x > 0. Determine the following probabilities:
If the number of people working is 2 stantard deviations above the mean, how many standard deviations above or below the mean do you expect sales to be? (Below or Above) What value of sales does tha
A survey of prices for external disk drives found the accompanying data, where 1 TB=1000 gigabytes. Some reseach on the prices discovered that the 210 Gb hard rive was a special "hardened" drive des
The probabilities that an adult man has high blood pressure and/or high cholesterol are shown in the table. Are high blood pressure and high cholesterol independent? Explain.
If the number of people working is 2 stantard deviations above the mean, how many standard deviations above or below the mean do you expect sales to be? (Below or Above)
Suppose an online business organizes an e-mail survey to find out if online shoppers are concerned with the security of business transactions on the Web.
Suppose that for the discrete random variable X, we have P(X = 1) = 1 ? P(X = 0). If E[X] = 3Var(X), find P(X = 1).
In a regression model the diagnostics show that the residuals are not normal and do not have constant variance. Which of the following is the best procedure to follow? Select one: Attempt to addres
In a multiple regression the first full model is fitted with all the explanatory variables. Several of the variables are not significant. Which one of the following is the best way to proceed? Selec
When point A is removed from a regression analysis the correlation coefficient decreases. Which one of the following must be correct.
A regression analysis includes the effect of Age, which is categorised into five levels. How many dummy variables should be defined for including it in the analysis?
A regression analysis includes Sex as an explanatory variable. How many dummy variables are required to be defined? When point A is removed from a regression analysis the correlation coefficient incr
The tire manufacturer decides that there will be too much negative publicity if more than ½% of its tires fail before the 20,000 mile mark. With some additional effort in the manufacturing pr
Find the distribution of the difference in heights for husband - wife. Find the probability that the wife will be taller than her husband.
To compare average maternal ages between smoking and non-smoking groups of mothers during the course of pregnancies, twenty-six mothers will be chosen from each of the two groups.
Find an article on the U.S. balance of payments and link the article in your discussion with a brief description.
Find any news article about an international merger or acquisition and summarize it in a discussion.
31% of a certain breed of rabbits are born with long hair. What is the probability that in a litter of 8 rabbits, exactly 5 will have long hair? (Give your answer correct to three decimal places.)