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In a randomized trial, who should be blinded to which treatment group the patient is assigned?
1. The patient
2. The person assigning the treatment
3. The person interviewing the patient
4. All of the above
At the .01 signficance level, can we conclude that there is more variation in the selling prices of the oceanfront homes?
The firm does not pay any dividends. Sales are expected to increase by 10 percent next year. If all assets, short-term liabilities, and costs vary directly with sales, how much additional equity financing is required for next year?
A box of 200 bolts of it known that 2% of such bolts are expected to be defective.(you may take the distribution to be poission; e-4=0.0183).
USA Today conducted a survey asking readers, "What is the most hilarious thing that has ever happened to you en route to or during a business trip?" a. What kind of sampling method is this?
Suppose we have the following information from a single regression: What is the coefficient of determination? What is the correlation coefficient?
Three coins are tossed simultaneously, consider the event E "Three heads or three tails" F " At least two heads" and G "Atmost two heads " of the pairs (E,F), (E,G) and (F,G), which are independent? Which are dependent?
multiple choice questions based on regression.the following information regarding a dependent variable y and an
A machine cuts circular filters from large rolls of material. If 7.3% of the filters fail to meet specifications, use the normal approximation to the binomial to compute the probability
The probability of a bulb lasting less than 2300 is .1573. The maximum probability of a bulb lasting less than 2300 hours should be only 5%. What must change specifically? How would that change be obtained practically?
Either no change to the Objective function or a raise in the value of the objective function depends on the constraint.
Set up dummy coded dummy variables to contrast each of the other groups to Group 2, medium Anxiety; run a regression to predict exam performance (Y) from these dummy coded dummy variables.
A telephone survey utilized a sampling frame of 2000 numbers, and had a response rate of 25%. A question asked respondents if they preferred Brand 1, Brand 2, or Brand 3.
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