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Some students in introductory statistics courses were asked to select a number between 1 and 30 (inclusive). The results are in the number variable in the little Survey data set.
a) Make a table showing the frequency with which each number was selected using table().
b) Make a histogram of these values with bins centered at the integers from 1 to 30.
c) What numbers were most frequently chosen? Can you get R to find them for you?
d) What numbers were least frequently chosen? Can you get R to find them for you?
e) Make a table showing how many students selected odd versus even numbers.
given below are two applications of statistics descriptive and inferential. choose what type of application is being
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If you select a random sample of 100 sessions, what is the probability that the sample mean is between 7.8 and 8.2 minutes?
Violent lyrics and aggressiveness. In the Journal of Personality and Social Psychology (May 2003), psychologists investigated the potentially harmful effects.
Which of these measures of central tendency would be likely to best serve the purposes of the management representative? Why?
Suppose that nine additional firms will be added to the bankruptcy rolls during the next quarter. How many of those failures are likely to be attribute to fraud?
let z be a random variable with a standard normal distribution and let x be a random variable with normal distribution
An insurance company is reviewing its current policy rates. When originally setting the rates they believed that the average claim amount was $1,800.
Convert each of the following z intervals to x intervals.
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Suppose electric power is supplied from two independent sources which work with probabilities 0.4 0.5, respectively.
The national sporting goods association conducted a survey of persons 7 years of age or older about participation in sports activities the total population in this age group was reported at 248.5 million with 120.9 million male and 127.6 million f..
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