A+ Answers



1. This table lists the numbers of officers and enlisted personnel for women in military. At = 0.05, is there sufficient evidence to conclude that a relationship exists between rank and branch of the Armed Forces?
                        Officers           Enlisted           Total
            Army   10791  62,491 73282
            Navy   7816    42,750 50566
            Marine Corps  932      9525    10457
            Air Force        11819  54,344 66163
            Total   31358  169110            200468
2. Listed is information regarding organ transplantation for three different years. Based on these data, is there sufficient evidence at = 0.01 to conclude that a relationship exists between year and type of transplant?
            Year    Heart   Kidney/Pancreas         Lung    Total
            2003    2056    870      1085    4011
            2004    2016    880      1173    4069
            2005    2127    903      1408    4438
            Total   6199    2653    3666    12518
3. The amount of sodium in one serving for a random sample of three different kinds of foods listed. At the 0.05 level of significance, is there sufficient evidence to conclude that a difference in mean sodium amounts exists among condiments, cereals, and deserts?
            Condiments    Cereals            Desserts
            270      260      100
            130      220      180
            230      290      250
            180      290      250
            80        200      300
            70        320      360
            200      140      300
4. Americans appear to be eating healthier. Between 1970 and 2007 the per capita consumption of broccoli increased 1000% from 0.5 to 5.5 pounds. A nutritionist followed a group of people randomly assigned to one of three groups and noted their monthly broccoli intake. At = 0.05, is there a difference in means?
            Group A          Group B          Group C
            2          2          3.7
            1.5       1.5       2.5
            0.75     4          4
            1          3          5.1
            1.3       2.5       3.8
            3          2          2.9
5. The average local cell phone monthly bill is $50.07. A random sample of monthly bills from three different providers is listed below. At = 0.05, is there a difference in mean bill amounts among providers?
            Provider X      Provider Y      Provider Z
            48.2     105.02 59.27
            60.59   85.73   65.25
            72.5     61.95   70.27
            55.62   75.69   42.19
            89.47   82.11   52.34
6. Annual child care costs for infants are considerably higher than for older children. At = 0.05, can you conclude a difference in mean infant day care costs for different regions of the United States?
            New England  Midwest          Southwest
            10390  9449    7644
            7592    6985    9691
            8755    6677    5996
            9464    5400    5386
            7328    8372   
7. Three popular fast-food restaurant franchises specializing in burgers were surveyed to find out the number of calories in their frequently ordered sandwiches. At the 0.05 level of significance, can it be concluded that a difference in mean number of calories per burger exists?
            FF#1    FF#2    FF#3
            970      1010    740
            880      970      540
            840      920      510
            710      850      510