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A population of scores forms a normal distribution with a mean of m = 80 and a standard deviation of s = 10.
a. What proportion of the scores have values between 75 and 85?
b. For samples of n = 4, what proportion of the samples will have means between 75 and 85?
a researcher randomly selects 6 fathers who have adult sons and records the fathers and sons heights to obtain the data
We wish to estimate the population proportion. We want to be 95 percent confident of our results and we want the estimate to be with .01 of the population parameter. No estimate of the population proportion is available. What value should we use f..
during the classical era in western music ca. 1750-1800 public audiences began to supersede private patrons and the
Compute the sample variance and the sample standard deviation for these data (to 2 decimals).
a survey was conducted of the age in years of 50 randomly selected customers. the mean was 27.47 years with a standard
A researcher wanted to determine the mean number of hours per week (Sunday through Saturday) the typical person watches television. Results from the Sullivan Statistics Survey indicate that s=7.5 hours
Write a system of inequalities representing this situation. Then draw a graph of the feasible region given these conditions, in which x is the number of AM radios and y is the number of AM/FM radios.
a researcher wished to compare the effect of two stepping heights low and high on heart rate in a step-aerobics
The standard screening test for Down's Syndrome is based on combination of maternal age and the level of serum alpha-fetoprotein. Using this test 80% of Down's syndrome cases can be identified, while 5 % of normals are detected as positive.
there are twelve zodiac signs and each person is born under exactly one sign. suppose that each sign is equally likely
Figure out the best means to calculate the reliabilty of our work load index ie a measure of work load per empolyee per hour - is there a statistical measurement i could use? i really need to verify the accuracy of this measurement.
When studying simultaneous responses to two categorical questions, we should set up a a) contingency table. b) frequency distribution.
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