Are stock splits beneficial to stockholders? snl financial studied

1. Are stock splits beneficial to stockholders? SNL Financial studied stock splits in the banking industry over an 18-month period. For a sample of 20 stock splits, 15 led to an increase in investment value, 3 led to a decrease in investment value, and 2 resulted in no change. Conduct a sign test to determine if it can be concluded that stock splits are beneficial for holders of bank stocks.
a) What are the null and alternative hypotheses?
b) Using α = .01, what is your conclusion?
2. A poll taken during the recession in 2008 asked 600 adults a series of questions about the state of the economy and their children’s future. One question was, “Do you expect your children to have a better life than you have had, a worse life, or a life about the same as yours?” The responses showed 240 better, 310 worse, and 50 about the same. Use the sign test and α = .01 to determine whether there is a difference between the number of adults who feel their children will have a better life compared to a worse life. What is your conclusion?
3. A test was conducted for two overnight mail delivery services. Two samples of identical deliveries were set up so that both delivery services were notified of the need for a delivery at the same time. The hours required to make each delivery follow. Do the data shown suggest a difference in the median delivery times for the two services? Use a .10 level of significance for the test.
Service Delivery  1  2
1  24.5  28.0
2  26.0  25.5
3  28.0  32.0
4  21.0  20.0
5  18.0  19.5
6  36.0  28.0
Service Delivery  1  2
7  25.0  29.0
8  21.0  22.0
9  24.0  23.5
10  26.0  29.5
11  31.0  30.0
3
4. Unisys maintains a hurricane database which provides information on hurricanes in the Atlantic/Caribbean/Gulf of Mexico and the Eastern Pacific Ocean. Maximum wind speeds in knots for a sample of hurricanes over the past four hurricane seasons are shown. Use α = .10 and test to determine whether the distribution of hurricane wind speeds is the same for these two regions. What is your conclusion?
Atlantic/Carribean/Gulf of Mexico  Eastern Pacific Ocean
Storm Max Wind Speed  Storm Max Wind Speed
Frances  125  Darby 105
Jeanne 110  Frank 75
Lisa  65  Isis  65
Emily 135  Hilary 90
Ophelia  80  Max  70
Rita  150  Bud  110
Wilma 150  Daniel 130
Ernesto  65  Sergio 95
Florence  80  Cosme 65
Helene 105  Flossie 120
Dean 145  Henriette  75
Karen 60  Ivo  70

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