4a) A group of statistics students believed that more than 50% of the LSU student population has 1 or 2 credit cards. After collecting data, the group found that 18 out of 31 LSU students in their sample have 1 or 2 credit cards. Does the group have sufficient evidence to believe that more than 50% of all LSU students have 1 or 2 credit cards? Perform a hypothesis test with α =.10.
Step 1: H0:__________ H1:___________
Step 2: α =____________
Step 3: Calculated test statistic:______________
Step 4a: Critical value(s) and region(s):____________
Step 4b: p-value:_____________________
Step 5: Compare the critical value with the test statistic and state the decision rule.
Conclusion regarding H0:____________________
Step 6: Conclusion in words:_________________________
Work or calculator keys used:_______________________
4b) Use the same data from 4a) above, create a 90% confidence interval to estimate the percentage of all LSU students who have 1 or 2 credit cards.
Set up the formula with the numbers in it, but you may use the calculator to finish it.
Confidence interval setup:______________________________________________
Any calculator commands used:_________________________________
4c) Interpret your confidence interval from 4b) above.
You are 90% confident that...
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