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12 Cards in this Set
 Front
 Back
If we use the X2 method of analysis to test for the differences among 4 proportions, the degrees of freedom are equal to

3


If we wish to determine whether there is evidence that the proportion of items of interest is the same in group 1 as in group 2, the appropriate test to use is

Both the Z test and the X2 test.


The squared difference between the observed and theoretical frequencies should be large if there is no significant difference between the proportions.

False


A test for whether one proportion is higher than the other can be performed using the chisquare distribution.

False


TABLE 124
A computer used by a 24hour banking service is supposed to randomly assign each transaction to one of 5 memory locations. A check at the end of a day's transactions gave the counts shown in the table to each of the 5 memory locations, along with the number of reported errors. REF QUIZ12 #5 Table 124 The bank manager wanted to test whether the proportion of errors in transactions assigned to each of the 5 memory locations differ. Referring to Table 124, which test would be used to properly analyze the data in this experiment? 
X2 test for difference among more than two proportions


TABLE 124
A computer used by a 24hour banking service is supposed to randomly assign each transaction to one of 5 memory locations. A check at the end of a day's transactions gave the counts shown in the table to each of the 5 memory locations, along with the number of reported errors. REF QUIZ12 #6 Table 124 The bank manager wanted to test whether the proportion of errors in transactions assigned to each of the 5 memory locations differ. Referring to Table 124, the degrees of freedom of the test statistic is 
4


TABLE 124
A computer used by a 24hour banking service is supposed to randomly assign each transaction to one of 5 memory locations. A check at the end of a day's transactions gave the counts shown in the table to each of the 5 memory locations, along with the number of reported errors. REF QUIZ12 #7 Table 124 The bank manager wanted to test whether the proportion of errors in transactions assigned to each of the 5 memory locations differ. Referring to Table 124, the calculated value of the test statistic is 
1.4999.


TABLE 124
A computer used by a 24hour banking service is supposed to randomly assign each transaction to one of 5 memory locations. A check at the end of a day's transactions gave the counts shown in the table to each of the 5 memory locations, along with the number of reported errors. REF QUIZ12 #8 Table 124 The bank manager wanted to test whether the proportion of errors in transactions assigned to each of the 5 memory locations differ. Referring to Table 124, at 1% level of significance 
there is insufficient evidence to conclude that the proportion of errors in transactions assigned to each of the 5 memory locations are not all the same.


TABLE 1211
The director of admissions at a state college is interested in seeing if admissions status (admitted, waiting list, denied admission) at his college is independent of the type of community in which an applicant resides. He takes a sample of recent admissions decisions and forms the following table: REF QUIZ12 #9 Table 1211 He will use this table to do a chisquare test of independence with a level of significance of 0.01. Referring to Table 1211, the alternative hypothesis claims that "there is some connection between admission status at the college and the type of community in which an applicant resides." 
True


The chisquare test of independence requires that the expected frequency in each cell to be at least 5.

False


TABLE 1213
Recent studies have found that American children are more obese than in the past. The amount of time children spent watching television has received much of the blame. A survey of 100 tenyearolds revealed the following with regards to weights and average number of hours a day spent watching television. We are interested in testing whether the mean number of hours spent watching TV and weights are independent at 1% level of significance. REF QUIZ12 #11 Table 1213 Referring to Table 1213, if there is no connection between weights and average number of hours spent watching TV, we should expect how many children to be spending no more than 6 hours on average watching TV and are more than 10 lbs. underweight? 
12


TABLE 1213
Recent studies have found that American children are more obese than in the past. The amount of time children spent watching television has received much of the blame. A survey of 100 tenyearolds revealed the following with regards to weights and average number of hours a day spent watching television. We are interested in testing whether the mean number of hours spent watching TV and weights are independent at 1% level of significance. REF QUIZ12 #12 Table 1213 Referring to Table 1213, suppose the value of the test statistic was 30.00 (which is not the correct value) and the critical value at 1% level of significance was 10.00 (which is not the correct value), which of the following conclusions would be correct? 
We will reject the null and conclude that mean number of hours spent watching TV and weights are not independent.
