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A bank with branches in a large metropolitan area is considering opening its offices on Saturday, but it is uncertain whether customers will prefer (1) having walk-in hours onSaturday or (2) having extended branch hours during the week. Listed below are some of theideas proposed for gathering data. For each, indicate what (if any) biases (problems) mightresult.
a) Put a big ad in the newspaper asking people to log their opinions on the bank'sWeb site.
b) Randomly select one of the branches and contact every customer at that bank byphone.
c) Send a survey to every customer's home, and ask the customers to fill it out andreturn it.
d) Randomly select 20 customers from each branch. Send each a survey, and followup with a phone call if he or she does not return the survey within a week.
the 72-hour blastogenesis of chicken peripheral blood lymphocytes from a group treated with pha and from an untreated
Construct a scatterplot for the (x, y) values below, and answer the following questions. What would be the slope of this regression line?
Conclude that the population average pulse rate is 71.8. Reject the hypothesis that the population average pulse rate is 70.
What does this data set imply about the possibility of predicting the boiling point of compounds in this series on the basis of the number of carbon atoms? Compute the correlation coefficient between these two variables, even though the number n i..
The lifetime of a color television picture tube is normally distributed with a mean of 7.8 years and a standard deviation of 3 years. What is the probability that a picture tube will last more than ten years?
Formulate this statement as a multiple regression model (form only, without parameter estimation).
based on all tax returns filed in 2001 the internal revenue service found the total deduction claimed on an itemized
Create a Histogram of the following data:
If the first head occurs on the first toss, you win $1. If the first head occurs on toss 2 or on toss 3 you win $2 or $3, respectively. If no heads appear, you lose $1 (that is, win -$1). Find the joint probability function for Y1 and Y2.
for a certain class of jet engines the time until an overhaul is needed y measured in years varies according to the
a school of optometry conducts a study in which 50 workers arerandomly selected from the population of white-collar
Show by induction on r that S ≡ 0, then that V ≡ 0. (b) Un is the unbiased estimator of g(Q) with smallest variance. Hint: For an unbiased estimator T with symmetrization W, W = Un by part (a).
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