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Chapter 11: Q. 94 (page 665)
Read the statement and decide whether it is true or false.
The number of degrees of freedom for a test of independence is equal to the sample size minus one.
The statement is false.
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What is the test statistic?
The manager of "Frenchies" is concerned that patrons are not consistently receiving the same amount of French fries with each order. The chef claims that the standard deviation for a ten-ounce order of fries is at most oz., but the manager thinks that it may be higher. He randomly weighs orders of fries, which yields a mean of oz. and a standard deviation of two oz.
The table provides a recent survey of the youngest online entrepreneurs whose net worth is estimated at one million dollars or more. Their ages range from to . Each cell in the table illustrates the number of entrepreneurs who correspond to the specific age group and their net worth. Are the ages and net worth independent? Perform a test of independence at the significance level.
The expected percentage of the number of pets students have in their homes is distributed (this is the given distribution for the student population of the United States) as in Table 11.12.
A random sample of students from the Eastern United States resulted in the data in Table 11.13.
At the significance level, does it appear that the distribution 鈥渘umber of pets鈥� of students in the Eastern United States is different from the distribution for the United States student population as a whole? What is the p-value?
The number of births per woman in China is down from in . This fertility rate has been attributed to the law passed in restricting births to one per woman. Suppose that a group of students studied whether or not the standard deviation of births per woman was greater than . They asked women across China the number of births they had had. The results are shown in Table. Does the students鈥� survey indicate that the standard deviation is greater than ?
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