The software company that wrote the operating system installed on CCC's computers recently issued an important update. The update is designed to install automatically, and the software company claimed that not more than 10% of users should experience any difficulties with the installation.

Wishing to test the credibility of this claim, CCC took a random sample of 200 of its customers, and asked them if the upgrade occurred without any issues. A total of 30 customers reported having difficulty of one form or another.

CCC wishes to test whether significantly more than 10% of its customers experienced difficulty with the update. Therefore they should test

Group of answer choices

A. H0: = 0.10 versus Ha: 0.10

B. H0: = 0.10 versus Ha: < 0.10

C. H0: = 0.10 versus Ha: > 0.10

D. H0: p = 0.15 versus Ha: p 0.15

E. None of the above.

What should you always assume when performing an hypothesis test?

Group of answer choices

A. No good deed goes unpunished.

B. The customer is always right.

C. The null hypothesis is true.

D. None of the above.

Suppose CCC wishes to test whether is significantly greater than 10%. What probability distribution should be used in the calculations?

Group of answer choices

A. t

B. Normal

C. Uniform

D. Betabinomial

E. None of the above.

Suppose CCC wishes to test whether is significantly greater than 10%. The standard error used in the calculations is?