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A 95% confidenceinterval for the population was computed to be .78 and .82. This indicates that about 80 out of 100 similarily constructed inervalswould include the population porportion.
When a customer comes to a bank, there are three primary locations they may select to go to: teller, loan officer, or escrow department. Based on past experience, the following probability distribut
The germination success rate for begonia seeds is 60%. In a package of 200 seeds. What is the probability that between 100 to 150 germinate(both inclusive)?
According to an exit poll taken by CNN during the 2008 Democratic Primary in Connecticut, 552 registered voters voted for Hilary Clinton and 598 for Barack Obama. Would you have been willing to pred
Yet a random sample of 1075 called to appear for possible duty yielded only 181 blacks. Using a significance level of 0.01, does this data argue strongly for a conclusion of possible discrimination?
Hypothesis: A. Cognitive behavior therapy (CBT) will be better than supportive therapy in reducing children's anxiety at posttreatment.
The tensile strength of a mental part is normally distributed with mean 40lb and standard deviation 5lb. if 50,000 parts are produced, how many would you expect to fail to meet a minimum specificati
88% of the booked passengers actually arrive for the flight. find the probability that if the airline books 21 persons there will not be enough seats will be available.
the number of widgets produced by 9 employees in an eight hour shift is recorded below. Find the mean number of widgets produced. 135, 120, 116, 119,121,125,135,131,123
The company would like to maximize the number of customers served while generating at least $1800 in revenue and honoring all reservations. How may rafting trips should be scheduled?
Test the claim that p is less than 0.301 by using = 0.1. What does the area of the sampling distribution corresponding to your P-value look like?
If 32 different pilots are randomly selected, find the probability that their mean weight is between 120 lb and 161 lb.
Plot this 20 maxima again on normal probability paper derive the theoretical distribution function for this 20 maxima and draw the CDF in the same plot.
Let x be N(µ,σ2 ) and consider the transformation x=log(y) or equivalently y=exp(x). Find the mean and the variance of y by first determining E(exp(x)) and E[(exp(x)^2 ], by using the mo
A deck of 52 cards is dealt face up in a row. What is the probability that all 4 aces and all 4 kings are adjacent (but in any order)?
Assume that you are working in the research department of a large chain of movie theatres in the USA. Is the theatre located in a Shopping Mall, in a Strip Mall, or is it free-standing?
When testing for a difference between the means of a treatment and a placebo group, the computer display below is obtained. using a 0.05 significance level, is there sufficient evidence to support t
The correlation between age and height of children is found to be about r=0.7. Suppose we use age x of a child to predict the height y of a child. Least squares regression line of y on x would have
Jenn has to be at work by 8:30 A.M. every morning. By what time must she leave home in the morning so that she is late for work at most 1% of the time?
Replacement times for CD players are normally distributed with mean of 7.1 years and a standard deviation of 1.4 years (based on data from "Getting Things Fixed," Consumer Reports). Find the probabi
Is there sufficient evidence to conclude that the proportion differs from the national percentage? Use α= 0.05. Interpret the p-value in context of the problem.
A sample of n = 20 scores ranges from a high of X = 9 to a low of X = 3. If these scores are placed in a frequency distribution table, how many X values will be listed in the first column?
Is there sufficient evidence at the 0.05 level of significance to conclude that the proportion of women physicians at the university health system exceeds 27.9%?
A random sample of gasoline taxes (in cents) is shown here for 12 states. Use the data to estimate the true population mean gasoline tax with 90% confidence. Does your interval contain the national
Let the random variable Y = max(x1, x2, x3, x4), find the cumulative distribution function and probability distribution function for Y.