Cross-tabulation & z-test | Mathematics homework help

Cross-Tabulation & Z-test


1. Thirty respondents were asked if they have the access to the 4G network and if they have used mobile banking services. The results showed that 11 people do not have the access to 4G and have not used mobile banking, 4 people have the access to 4G but have not used mobile banking, 12 people have the access to 4G and have used mobile banking, and 3 people do not have the access to 4G but have used mobile banking (using friends’ smartphone). (2.5 pts.)


A)   Present the results in a cross-tabulation table. (1 pt)

B)   What would be appropriate “independent” variable and dependent variable? (.5 pt)

C)   Covert the 4G x Mobile Banking cross-tabulation table in answer A) into a percentage table. (1 pt)


2. According to the past 5 years of experience, a professor knows that the average hours his students spend on the final project is 15 (standard error of the mean = 0.9).  In order to see whether or not the time his students spend on the project has decreased this semester, he randomly sampled 50 of his students and calculated the average hours as 14. Follow the steps below. (2.5 pts.)



  1. State an appropriate null hypothesis and alternative hypothesis.
  2. Find the critical values at significant level p=.05
  3. Calculate the z-statistic.
  4. Compare z-statistic with critical values.
  5. Make a decision on if the students spend less time this semester.  

3. Browse the NBA 2015-2016 regular season webpage ( and look at the numbers in HOME and ROAD columns.  Pick any two teams and for each team create a Game Location (home vs. road) x Game Result (won vs. lost) cross-tabulation table.  In your posting discuss 1) for each team if game locations affect their game results, and 2) which team’s game results are more heavily influenced by game locations? Be sure to use numbers to support your conclusions. Hint: Convert each cross-tabulation table to a percentage table. Have fun!



-Please SHOW all the calculations

-It is due on 2nd May at 3 pm California Time. You have more than 20 hours to finish this work 

-Please see the Powerpoint I attached for the step by steps solution


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