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In a normal distribution, what percentage of scores fall between -1 and +1 standard deviations from the mean?
Between the mean and -2 standard deviations ? Between the mean and +3 standard deviations?
A venture capitalist invests in one firm of each type. Assume the companies function independently. What is the probability that both companies become profitable?
What is the probability that 11 or more of these consumers have called an 800 or 900 telephone number for information about some product?
Carry your intermediate computations to at least four decimal places. Round your answer to at least three decimal places.
a microchip company has two machines that produce the chips. machine i produces 55 of the chips but 5 of its chips are
what is the area under the normal curve between z -1.0 and z
Give an example that follows either the binomial or Poisson distribution, and why that example follows that particular distribution.
Use the given data to find the best predicted value of the response variable.Eight pairs of data yield r = 0.708 and the regression equation y = 55.8 + 2.79x. Also, mean y = 71.125. What is the best predicted value of y for x = 5.7?
Banner Mattress and Furniture Company wishes to study the number of credit applications received per day for the last 300 days.
Let sample s approximate population sigma. How come the t- table in the AP booklet has degrees of freedom entries way past 30 ??? What am I missing??
A sample of 160 workers in the downtown area classified each worker by race. A bar graph of the results is given below, but the bar for black workers in the graph below has been omitted.
A researcher wishes to test the claim that the average age of lifeguards in Ocean City is greater than 24 years. She selects a sample of 36 guards and finds the mean of the sample to be 24.7 years with a standard deviation of 2 years. Is there evi..
Demand for a popular athletic shoe is nearly constant at 800 pairs per week for a regional division of a national retailer. The cost per pair is $54.
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