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stat ch 7.1 hw

# stat ch 7.1 hw - HW 7.1-7.3 FA10 1 of 5...

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Web Assign HW 7.1-7.3 FA10 (Homework) Chris O'Neal STAT 7770 FA10, Fall 2010 Instructor: Chandler Pike Current Score : 0 / 100 Due : Monday, October 4, 2010 05:30 PM EDT 0/8 submissions 1. –/26 points According to a recent Current Population Reports , the population distribution of number of years of education for self-employed individuals in the United States has a mean of 13.3 and a standard deviation of 2.2. (a) Identify the random variable X whose distribution is described here. (b) Find the mean and standard error of the sampling distribution of for a random sample of size 90. Mean = (1 decimal place) Standard Error = (5 decimal places) (c) Find the mean and standard error of the sampling distribution of for a random sample of size 399. Mean = (1 decimal place) Standard Error = (5 decimal places) (d) Describe the effect of increasing n . (e) If a sample of size 399 is selected from this population, what is the probability that the sample average will be less than 13.7? probability = (4 decimal places) (f) Suppose a random sample of 4 self-employed individuals is selected at random from the population described above. The sample data values are: 14, 10, 13, 12. (i) The sample mean is (2 decimal places) (ii) The sample standard deviation is (4 decimal places) 2. –/16 points number of self-employed individuals number of years of education number of educated individuals in the United States number of self-employed individuals in the United States The mean increases. The mean stays the same. The mean decreases. The standard error increases. The standard error stays the same. The standard error decreases. HW 7.1-7.3 FA10 http://www.webassign.net/[email protected]/student.pl?c=2010092913... 1 of 5 9/29/2010 9:44 AM

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At a university, 61% of the 7400 students are female. The student newspaper reports results of a survey of a random sample of 50 students about various topics involving alcohol abuse, such as participation in binge drinking. They report that their sample contained 26 females.
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