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# 4a) A group of statistics students believed that more than 50% of the LSU student population has 1 or 2 credit cards.

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:______________________________________________

Confidence interval:_____________________________________

Any calculator commands used:_________________________________

4c) Interpret your confidence interval from 4b) above.

You are 90% confident that...

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A group of statistics student believed that more than 50% of LSU student population has 1 or 2
credit cards. After collecting data, the group found that 18 out of 31 MSU students in their
sample...

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