Hypothesis Testing & Confidence Interval explained in this answer
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A medical researcher estimates that no more than 55% of the U.S. adults eat breakfast every day. In a random sample of 250 U.S. adults, 56.4% say that they eat breakfast every day. At alpha =.01, is there evidence to reject the researcher's claim ?
A) Test Statistic
B) Graph
C) Conclusion
D) Construct a 99.9% C.I. for the proportion of adults who eat breakfast .
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Solution Summary
The solution provides step by step method for the calculation of testing of hypothesis and confidence interval. Formula for the calculation and Interpretations of the results are also included. Interactive excel sheet is included. The user can edit the inputs and obtain the complete results for a new set of data.
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Proportional Confidence Intervals:
A medical researcher estimates that no more than 55% of the U.S. adults eat breakfast every day. In a random sample of 250 U.S. adults, 56.4% say that they eat breakfast every day. At alpha =.01, is there evidence to reject the researcher's claim?
Answers
The null hypothesis tested is
H0: The proportion of U.S. adults eats breakfast every day ≤ 0.55. (p ≤ 0.55)
The alternative hypothesis is
H1: The proportion of U.S. adults eats breakfast every day > 0.55. (p > ...
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