1. You're an accounting manager. A year-end audit showed 3% of transactions had errors. You implement new procedures. A random sample of 150 transactions had 4 errors. You want to know if the proportion of incorrect transactions decreased.

Which assumption or condition if any does not check out?

Randomization assuption

n.p> or =10 and n.q > or =10

Independenceassumption

They all check out.

2.A researcher claims that more than 38% of U.S. adults have been a victim of identity theft. In a random sample of 485 U.S. adults, 199 of them have been a victim of identity theft. Use a 10% significance level to determine if there is enough evidence to support the researcher's claim.

H_o:[null]

H_A:[alt]

Z-stat =[z]Round to 2 decimal places.

p-value =[pval]Do not round.

Decision:[D]Type either Reject H_oor Retain H_o

3.In a clinical trial, 19 out of 800 patients taking a prescription drug complained of flulike symptoms. Suppose that it is known that 2.9% of patients taking competing drugs complain of flulike symptoms.

Is this sufficient evidence to conclude that less than 2.9% of this drug's users experience flulike symptoms as a side effect? (Let =0.05)

H_o:

H_A:

Z-stat =Round to 2 decimal places.

p-value =

Decision:Type either Reject H_oor Retain H_o

Write a summary statement for the hypothesis test.