1)

An auditor reviewed 25 oral surgery insurance claims from a particular surgical office, determining that the mean out-of-pocket patient billing above the reimbursed amount was $280.11 with a standard deviation of $77.78.

At the 5 percent level of significance, does this sample prove a violation of the guideline that the average patient should pay no more than $250 out-of-pocket?

(a-1)H₀: $250 versusH₁:> $250. Choose the right option.

1. RejectH₀ift_calc< 1.711
2. RejectH₀ift_calc> 1.711

multiple choice 2

• a
• b

(a-2)Calculate the test statistic.(Round your answer to 2 decimal places.)

Test statistic

2)-

In a recent survey, 10 percent of the participants rated Pepsi as being "concerned with my health." PepsiCo's response included a new "Smart Spot" symbol on its products that meet certain nutrition criteria, to help consumers who seek more healthful eating options.

Suppose a follow-up survey shows that 26of 200 persons now rate Pepsi as being "concerned with my health."

Calculate thezstatistic.(Round your answer to 3 decimal places.)

z_calc

At = .05, would a follow-up survey showing that 26 of 200 persons now rate Pepsi as being "concerned with my health" provide sufficient evidence that the percentage has increased?