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Question : The mean of a normal probability distribution is 60; the standard deviation is 5.
(a) About what percent of the observations lie between 55 and 65?
(b) About what percent of the observations lie between 50 and 70?
(c) About what percent of the observations lie between 45 and 75?
Compute lower and upper quartiles of log10-balances? Determine 95% range of the balances in $s? Express in English what the two boundaries mean.
A research analyst regresses the number of calls for service (Y) on the Fahrenheit temperature at 4:00 in the afternoon (X). The regression equation finds: Y = 62 + 2.4 X with an r 2 of .67
Fast Service Truck Lines uses the Ford Super Duty F-750 exclusively. Management made a study of the maintenance costs and determined the number of miles traveled during the year followed the normal distribution. The mean of the distribution was 60..
Does this sample indicate a smaller average? Use α = 0.05 and assume a normally distributed population.
What does r 2 of .73 tell us? Is this a strong or weak correlation? How can you tell?
What is the probability that a cereal would both high calorie and high fiber? In other words, what is P (high calorie and high fiber)?
Then use ogive to estimate median and first and third quartiles. Also utilize it to reply following question: What percent of 60 mutual fund loads are less than 75.
A bank official reported the results of a regression analysis designed to predict the bank's charges (y), measured in dollars per month, for services rendered to local companies.
At 1 excavation site 8641 pot shards have been found that have not presently been cleaned also identified. Define the probability.
Create a set of n observations from the binomial distribution with 1 trial and the event probability of 0.007, where n is your answer.
Perform a parametric analysis by assessing the fractional change in the probability of failure with respect to a small change in the mean and standard deviation of selected variable.
Determine the probability that Mexican American male in the 20 -74 age range has serum cholesterol value greater than 240 mg/dl.
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