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The time to complete this flat route follows a normal distribution with a mean of 143 minutes and standard deviation 20 minutes. If it takes James 91 minutes to complete his loop, andit takes Rob 86
The following data set gives values of oxygen capacity values while the participants pedaled at a specified rate on a bicycle ( 14, 16, 18,19, 20, 21, 21, ,21, 22, 23, 23, 24, 26, 35, 36 ). Are ther
The NYPD precincts in Manhattan are numbered from 1 to 34. If the variable "precinct" is included in a dataset about crime in New York, the variable scale is:
The number of robberies in each precinct in 2009 is what level of measurement?
In 2004, Statistics exam scores followed a normal distribution with a mean of 70 points and a standard deviation of 7. using the empirical Rule, an estimate for the proportion of values between 49 a
According to the records of an eletric company sering the boston area, the monthly electric consumption during winter for all households is normally distributed, with a mean of 1650 kilowatt-hours
Below are the numbers of deaths from tornados in the U.S. from 1990 through 2000.
What Percentage of speeds was above 60 miles/h or below 20 miles/h?
Please select 5 values for each of the two data sets and practically calculate the standard deviation and coefficient of variation for each data set to clarify your explanation.
Construct a 90% confidence interval for the mean age of all customers, assuming that the assumptions and conditions for the confidence interval have been met?
Assuming a line of regression of Y = 2.1 + 0.8X between temperatures and production yield. If the average temperature is 15 degrees, what is the value of the yield?
Suppose that X and Y are discrete random variables with a joint probability mass function pXY(x, y).
An article in the winter 2003 issue of chance magazine reported on the Houston Independent School district's magnet schools programs. Of the 1755 qualified applicants, 931 were accepted 298 were wa
The following data represents the mean August temperature ( Fahrenheit) in 20 us cities: 64, 64, 68, 69, 70, 71, 71, 72, 74, 75,76,76,76, 77, 81, 82, 82, 83, 85, 92 . construct a split-stem polt.
The daily milk production of cows is normally distributed with a mean of about 35 kg/day and a standard deviation of 7 kg/day. What is the 10th percentile (in kg) of the daily milk production appro
What is the probability that in the sample fewer than 35% are willing to spend extra for products and services from socially responsible companies?
The entrance exam at a university is normally distributed with a mean of 520 and a standard deviation of 75. If only the top 10% of hte students are accepted, approximately, what is the lowest scor
A team of two people to be selected out of 5 men and 5 women. A random variable X is defined to be the number of men selected. Find the standard deviation.
The general manager of a luxury hotel decides the quality of housekeeping by inspecting 15 rooms. consider that the hotel offers economy and business-class roomsas well as suites. Slect the best met
A random variable X is defined by assigning to each outcome the total number of red balls drawn. Find the expected value of X.
A business magazine mailed a questionaire to the human resource directors of all the Fortune 500 companies, and received respones from 32% of them. Those responding reported that they did not find t
Construct a 95% confidence interval for the standard deviation of the number of hours this firm's employees spend on work-related activities in a typical week.
To investigate the fluid mechanics of swimming, twenty swimmers each swam a specified distance in a water-filled pool and in a pool where the water was thickened with food grade guar gum to create a
Test the given claim using the traditional method of hypothesis testing. Assume that the sample has been randomly selected from a population with a normal distribution.
Let x have Normal distribution with mean 11.3 and standard deviation 5.7. Find the cumulative probability of 9.31 or smaller . P(x <= 9="" 31="" p="">