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Determine the probability mass function for Y. Identify the distribution of Y
The continuously compounded rate of return on a particular stock has a normal distribution with mean 10 % and standard deviation 20 %. The stock's price is currently 50$. Calculate the probability t
What does collinearity mean in the context of regression analysis?
In a multiple regression model of salary (in $,000) as response with Male as a dummy variable taking the value 1 for male and 0 for female, the coefficient of Male is -3.4 with a p-value of 0.001. W
When seven variables are fitted into a regression model, only three are significant. Which one of the following is the correct next step?
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