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According with the IRS the taxpayers spent an average of 330 minutes in preparing, copying and to file in an electronic way the fiscal form 4020. An organization that watches over the consumers it selects a chance sample of 40 taxpayers and finds that the time needed to prepare, to copy and to file the form 4020 is 80 minutes. a) Which is the standard error of the median in this example?
b) Which is the probability of that the median of the sample or average medians is greater or more than 320 minutes?
c) Which is the probability of that the median of the sample or average medians be between 320 and 350 minutes?
d) Which is the probability of that the average or median of the sample is greater than 350 minutes?
What IQ score should one have in order to be eligible for Mensa?
Make a scatter plot, illustrate the regression lines. Determine the correlation coefficient between husband’s and wife’s education for couples in which wife is employed full time?
Find the probability that a women develops breast cancer given that she has a family history of breast cancer._____________
he population consists of all 15 year olds living in the attendance district of a local high school. You plan to obtain a simple random sample of 200 such residents by using the roster of the high school as the sampling frame.
What is the probability that all tree students pick a different card?
What is the expected number of customers that will have to wait more than 6 hours?
What is the sample space for this process and evaluate the variance of the intelligence scores
Using the simple test of independence (described in the lecture), decide if the events high calorie and high fiber are independent or dependent. Show your work.
Develop three regression models to predict the selling price based upon each of the other factors individually. Which of these is best?
Find out the operating characteristics for this system.
In a distribution of scores, the arithmetic mean is 51, the median is 55, and the mode is 62. What is the score, in percentile form, of a subject who does less well than two-thirds of the sample?
Compute the sample variance and the sample standard deviation for these data (to 2 decimals).
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