The Left is Right Club of America claims that 9% of U.S. adults are left handed....
The Left is Right Club of America claims that 9% of U.S. adults are left handed. You randomly call
1237 adults and 87 say that they are left-handed. Is there a difference in the percent of left handers?
Find/use p to 2 decimals.
a) Write the H0 and Ha to test.
b) Check the conditions and assumptions for statistical inference.
c) Calculate the standard deviation, to 4 decimals. (no sentence)
d) Sketch the model for the problem, include p in the sketch. (no sentence)
e) Calculate the p-value, to 4 decimals. Showing ALL work. (Remember “difference”)
h) At a significant level of α= 2% or α = .02, state your conclusion in context of the problem.
g) Find a 98% confidence level and interpret it. Show work. [Remember SD(p) ≠ SE(p) ]
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The Left is Right Club of America claims that 9% of U.S. adults
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professor has underestimated the number of students with part-time
or full-time jobs. A random sample of 85 students shows that 40
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27
44
43
48
53
46
30
51
42
52
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men with and without beards. What is the appropriate statistical
test for him to use?
2) Carefully write down the null and alternative hypotheses for
Dumbledore's test, being sure to define any symbols you use. (You
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3) Dr. Dumbledore conducts the test and (correctly) obtains a
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