Question
I cannot figure out this problem using my TI-84 calculator. How can I use the 2-SampleT (option 0) when I do not have the standard
I cannot figure out this problem using my TI-84 calculator. How can I use the 2-SampleT (option "0") when I do not have the standard deviation or a Confidence Interval in this in this problem? And if I use if I use the 2-PropZtest, I do not have the CI key available. What am I doing wrong? Please help!
Below is the question I am having trouble with at the moment.
A surveyasked, "How many tattoos do you currently have on yourbody?" Of the1224malessurveyed,
198responded that they had at least one tattoo. Of the1090femalessurveyed,131
responded that they had at least one tattoo. Construct a90% confidence interval to judge whether the proportion of males that have at least one tattoo differs significantly from the proportion of females that have at least one tattoo. Interpret the interval.
Letp1represent the proportion of males with tattoos andp2represent the proportion of females with tattoos. Find the90% confidence interval forp1p2.
The lower bound is_______
The upper bound is_______
(Round to three decimal places asneeded.)
Interpret the interval.
A.There is90% confidence that the difference of the proportions is in the interval. Conclude that there is
insufficientevidenceofasignificant difference in the proportion of males and females that have at least one tattoo.
B.There is a90% probability that the difference of the proportions is in the interval. Conclude that there is
asignificant difference in the proportion of males and females that have at least one tattoo.
C.There is a90% probability that the difference of the proportions is in the interval. Conclude that there is
insufficientevidenceofasignificant difference in the proportion of males and females that have at least one tattoo.
D.There is90% confidence that the difference of the proportions is in the interval. Conclude that there is
asignificant difference in the proportion of males and females that have at least one tattoo.
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